Anime Astral Simulator Update 15 adds a huge amount of new content, including World 19, a new raid, servant gacha, the Mana Contract system, Shadow Passives, new swords, Zen Kai progression, party bonuses, new quests, ranks, promotions, potions, and more.
The new world is called Fuku City, and there is plenty to work through before you have everything unlocked. Some of the new systems also connect directly to your existing progression, so understanding how they work early can save you a lot of grinding.
In this guide, I’ll go through everything added in Update 15, including the new world, Holy Grail War raid, servant system, Mana Contract, Shadow Passives, sword gacha, Zen Kai, new progression systems, codes, and the important rewards you can get.
Anime Astral Simulator Update 15 Guide – New World 19, Raid, Gacha, Zen Kai & Codes
Update 15 adds a large batch of new content and progression features.
| New Content | Details |
|---|---|
| New World | World 19 – Fuku City |
| New Pets | 10 |
| New Avatars | 7 |
| Main Questline | 1 new questline |
| Side Quest | 1 new side quest |
| Title Reward | 1 new title |
| Boss | 1 new boss |
| Pet Accessories | 3 |
| World Bus Accessory | 1 |
| New Raid | Holy Grail War |
| New Gacha | Servant Gacha |
| New System | Mana Contract |
| New System | Shadow Passives |
| New Gacha | Mystic Code |
| New Gacha | Sword Gacha |
| New Progression | Mage Craft |
| New Progression | Zen Kai |
| New Potion Tier | Tier 4 |
| Max Level | 325 |
| New Rankups | 10 |
| New Promotions | 2 |
| Global Quests | 13 |
How to Unlock World 19 – Fuku City
The main destination in Update 15 is Fuku City, which is World 19.
Once you reach the required progression, you can travel to the new world and start working through its quests, enemies, summons, and new systems.
Fuku City is also where several of the new Update 15 features are located, including the Holy Grail War raid, servant gacha, Mana Contract mechanics, and other new content.
Because the enemies in this world are considerably stronger, I recommend making sure your existing units, weapons, and other progression systems are upgraded before trying to push too far.
Holy Grail War Raid
One of the biggest additions in Update 15 is the Holy Grail War raid.
The raid is located in Fuku City and requires a Command Seal Key to enter.
How to Get a Command Seal Key
Command Seal Keys can be obtained from the seven enemies of the world.
Once you have a key, you can enter the raid and start working through its waves.
Holy Grail War Raid Waves
The raid contains:
- 100 waves
- A boss every 5 waves
- Grail Shards
- Tokens
- Relics
- New character-related rewards
- New equipment and weapon rewards
The raid is also where you can obtain three of the new world pets. These are not simply obtained by defeating the raid’s main boss, so make sure you’re farming the appropriate enemies if you’re looking for them.
Holy Grail War Rewards
Some of the notable rewards connected to the raid include:
- Grail Shards
- Relics
- Avatar Goat
- Merlin Staff
- Ishtar Crown
- New character rewards
- Sword Token 3
The Sword Token 3 is particularly important because Update 15 introduces new Astral-level swords.
Servant Gacha
Update 15 also introduces a completely new Servant Gacha in World 19.
You use Servant Tokens to spin the gacha, and the system can produce servants ranging up to Astral rarity.
The servant system works somewhat differently from regular pets and shadows.
Your strongest servant is the one that follows you around and fights alongside you. The amount of damage it deals is based on your servant progression and contract level.
Servant Damage
Servants have their own damage contribution, allowing them to fight alongside you while you’re clearing enemies.
You can also choose which servant appears around your character for visual purposes, meaning your displayed servant doesn’t necessarily have to be the same one you’re using for your strongest combat setup.
Servant Leveling
Servant progression is tied to the new Mana Contract system.
Importantly, the contract level belongs to your account rather than a specific servant. This means you don’t lose your progression when switching to another servant.
That’s useful because you can change servants without having to completely restart their progression.
Mana Contract System
The Mana Contract is another major system introduced in Update 15.
You can increase your Mana Contract level by collecting mana.
There are two main ways to do this.
Defeat Enemies
Enemies from World 19 and above can contribute to your mana progression.
Keep farming enemies normally and your Mana Contract will continue progressing.
Collect Mana Circles
Mana Circles can also appear around Fuku City.
When you find one, stand inside the circle and allow it to fill.
Be careful, though. Leaving the circle before it finishes cancels the absorption.
Mana Circles are global, so only the first player to absorb one gets its reward.
Mana Contract Levels
Each Mana Contract level increases your power and makes your servant deal more damage.
The important part is that this progression is tied to your account.
For example, if you switch from one servant to another, your Mana Contract level remains intact.
This makes it worth investing in the system early rather than waiting until you have your perfect servant.
Servant Position Mode
At Mana Contract Level 25, you unlock Position Mode.
This lets you place your servant at a specific location instead of having it follow you.
The mechanic works similarly to characters that can be planted in one location and left to attack enemies there.
This can be useful when you’re farming multiple areas at once.
However, there are some limitations:
- Your contract power stops counting while using the planted setup.
- The servant deals 50% damage while planted.
- You cannot plant the servant inside a game mode.
So while Position Mode can be useful for passive farming, following mode remains important when you need maximum servant damage.
Shadow Passives
Update 15 adds Shadow Passives, which allow you to roll a passive onto a shadow you already own.
You need a Shadow Passive Token to perform a roll.
These tokens come from enemies.
The passive increases the damage of the specific shadow you apply it to. You can also give the shadow a name through the altar system.
Shadow Passive Rerolls
If you roll again, your existing passive is only replaced when the new result reaches the required rarity threshold.
This prevents a better passive from being accidentally replaced by a weaker one.
The system can eventually provide up to 100% damage when you reach Divine rarity.
Because of that, Shadow Passive Tokens are worth saving if you’re trying to build a strong endgame shadow.
Mystic Code Gacha
Another new gacha has been added to Fuku City: the Mystic Code Gacha.
It uses Mystic Code Tokens and can provide rewards up to Astral rarity.
If you’re already farming the new world, it’s worth keeping an eye on the tokens you’re collecting because they give you another way to improve your account outside the regular servant system.
Sword Gacha
Update 15 also adds a new Sword Gacha.
The new swords come with significantly higher stats than many of the older weapons.
The new progression includes multiple rarities, with higher-tier swords reaching very high power values.
New Sword Progression
The new sword rarity progression includes:
- Epic
- Legendary
- Divine
- Astral
The power increase is substantial, especially once you reach the higher rarities.
Because of this, older swords can become much less useful compared with the new World 19 weapons.
There is also a pity/Q system, so make sure you’re taking advantage of it while rolling rather than relying entirely on luck.
Mage Craft Progression
Update 15 introduces Mage Craft progression.
This system gives you another way to increase your power by leveling the new progression using its associated currency.
As you continue upgrading Mage Craft, you can improve your overall account progression and keep up with the stronger enemies introduced in World 19.
If you’re pushing into the new endgame content, don’t ignore this system.
Zen Kai System
Another new progression feature is Zen Kai.
This system works through enemy kills and a power-level bar.
You can start progressing it by defeating enemies from World 2 onward.
As you fill the bar, you unlock permanent boosts.
Zen Kai Boosts
The system can improve things such as:
- Power
- Damage
- XP
- Luck
- Drops
Once your power level reaches 100%, you can perform a Zen Kai.
After using Zen Kai, the power level returns to 0%, but the boosts you’ve already obtained become stronger.
Zen Kai also unlocks additional boosts on top of the ones you already have.
This makes it a long-term progression system rather than something you complete once and forget.
There are also multiple Zen Kai opportunities tied to the progression window.
Party Bonus
Playing with other players gets an additional benefit in Update 15.
When multiple players are inside the same room or game mode, everyone can receive extra damage and drop bonuses.
The bonus starts counting from the second player.
Each additional player provides:
- 2.5% damage
- 0.5% drop bonus
The bonus can reach a maximum of:
- 12.5% damage
- 2.5% drop
This happens with six players in the same room.
Where the Party Bonus Works
The party bonus works in several game modes, including:
- Raids
- Defense
- Dungeons
- Boss Rush
- Time Trials
- Run City
The bonus is displayed on your screen while you’re inside a supported mode.
So if you’re farming one of the difficult new modes, bringing other players can provide a useful boost to both damage and drops.
New Potion Tier
Update 15 adds Potion Tier 4.
Potions are already an important part of progression because their effects can be stacked, so the new tier gives players another way to increase their performance.
If you’re preparing for the new raid or pushing through World 19, make sure you’re using your stronger potion tiers rather than saving them forever.
Level Cap Increased to 325
The maximum player level has been increased to 325.
This gives you additional levels to work through alongside the new World 19 progression.
Update 15 also adds:
- 10 new rankups
- 2 new promotions
- 13 new global quests
These provide additional progression beyond simply leveling your character.
New Global Quests
There are 13 new global quests in Update 15.
Some of these quests are tied to the new systems and progression, so make sure you’re checking the quest menu instead of focusing only on combat.
The new quests can also help you progress toward the additional ranks, rewards, and other Update 15 content.
Update 15 Codes
Update 15 also comes with a large batch of codes and rewards.
The update includes codes connected to milestones such as visits and likes, along with other update-related rewards.
Some codes can provide useful free items such as tickets and progression resources.
Because codes can expire or become unusable after you’ve redeemed them, it’s worth entering the currently available ones as soon as possible.
Codes Mentioned With Update 15
The update included milestone codes such as:
- 85MVisits
- 75MVisits
- 1.25MLikes
Some older like-based codes may not work if you’ve already redeemed them.
The important thing is to test each code through the game’s code redemption menu because previously claimed rewards will naturally show as unavailable on your account.
New Bundles
Update 15 also adds new bundles to the shop.
One of the notable additions is an Ultimate Bundle, which includes several useful rewards.
The update also adds new pets, accessories, mounts, and potions through the shop and bundle system.
One of the featured additions is an Ichigo-related pet, along with other new items.
New Pets and Accessories
There are 10 new pets and 3 new pet accessories in Update 15.
The update also includes a new world bus accessory.
These new items can be collected alongside the other rewards from World 19 and its associated systems.
Some of the new equipment has substantially higher stats than older items, so check your inventory after updating rather than assuming your previous setup is still optimal.
How to Prepare for Update 15
If you’re just reaching World 19, I recommend handling the update in a specific order.
1. Unlock Fuku City
Get access to World 19 first so you can start collecting the new currencies and resources.
2. Start Farming World 19 Enemies
Farm the enemies around Fuku City to build your new progression systems while also working toward Command Seal Keys and other drops.
3. Build Your Mana Contract
Start collecting mana immediately.
Your Mana Contract affects your servant progression, and the levels remain on your account even when you change servants.
4. Start the Servant Gacha
Use your Servant Tokens to build a strong servant.
Once you have a good servant, continue leveling your Mana Contract rather than constantly changing your main setup.
5. Farm Shadow Passive Tokens
If you have strong shadows, use Shadow Passive Tokens to improve their damage.
Don’t waste your rerolls by replacing a good passive with a weaker one.
6. Work on Zen Kai
Continue killing enemies across the game’s worlds to build your Zen Kai progression.
The permanent boosts become increasingly useful as you progress further into the update.
7. Upgrade Your Weapons
The new sword progression has a huge amount of power creep, so start replacing outdated weapons with the new World 19 options.
8. Try the Holy Grail War
Once you’re strong enough and have a Command Seal Key, start farming the new raid for its unique rewards.
The raid is one of the main sources of Update 15’s new equipment and progression materials.
Anime Astral Simulator Update 15 is much more than just another world update. Fuku City introduces an entire collection of new systems, with the Holy Grail War raid, Servant Gacha, Mana Contract, Shadow Passives, Mystic Codes, new swords, Mage Craft, and Zen Kai all adding new layers of progression.
If you’re trying to get caught up quickly, I’d focus on unlocking World 19 first, then work on your Mana Contract and servant while farming the materials needed for the new weapon and shadow systems. Once your account is strong enough, the Holy Grail War becomes one of the main activities to farm for the update’s rewards.
And don’t forget to check the codes and new quests before you start grinding. There are a lot of free rewards and progression sources in Update 15, so there’s no reason to leave them unused.