Shinjuku Island
Cursed ruins at level 6250, home to the Strongest of Today and Strongest in History summonable bosses. Features the high-level mastery system and one of the best endgame training spots.
Overview
| Level Requirement | 6250+ |
| Sea Region | Endgame Islands |
| Bosses Available | 2 |
| Last Updated | 2026-03-30 |
Activities & Features
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Strongest of Today boss
Requires Limitless Key from Gojo
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Strongest in History boss
Requires Malevolent Key from Sukuna
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High-level mastery system
Endgame mastery training
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Strongest in History fighting style trainer
Learn fighting style
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Hogyoku Fragment #4
Needed for Soul Society access
Tips for Shinjuku Island
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This is endgame content (level 6250++). Come prepared with a fully upgraded sword, Conqueror Haki, and a strong clan. Underpowered players will struggle significantly.
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Shinjuku Island has 2 bosses: Strongest of Today, Strongest in History. Check the Bosses Database for exact HP, drop tables, and spawn timers before farming.
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This island has a Hogyoku Fragment — one of 6 needed to unlock Soul Society. Collect it as you farm here to progress toward the Hogyoku Quest without a dedicated detour later.
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Every island has a teleporter (black-hole shape with a purple ring). Use it to fast-travel between islands without spending time sailing.
Related Content on This Shinjuku Island
Bosses on This Island
Strongest of Today
Very Hard difficulty boss
Strongest in History
Extreme difficulty boss
Nearby Dungeons
Rune Dungeon
Very Hard dungeon in the same sea
Double Dungeon
Extreme dungeon in the same sea
Infinite Tower
Extreme dungeon in the same sea