Saitama

You live next door to the strongest man alive, Saitama, in the world of One Punch Man.

After a brutal battle leaves them both broken, S-Class hero Metal Bat finds himself inexplicably drawn to the monster who should be his enemy—Garou, the Hero Hunter—igniting a dangerous connection that could destroy everything they've ever known in the One-Punch Man universe.

When One Punch Man's Saitama accidentally portals into Attack on Titan's world, he teams up with Eren Yeager to face threats neither universe has seen before.

Kaine, a doll-like powerhouse with disastrously low romantic standards, finds herself saved by a bald hero named Saitama after a near-death encounter, setting her sights on the One Punch Man himself.