Tsurugi Kiren is the undisputed strongest “Buster” in the world, renowned for single-handedly conquering humanity-ending dungeons. However, trapped by the hidden curse of a shadowy mastermind working behind the scenes, Kiren is plunged into a deep, five-year coma.

When he finally opens his eyes, he discovers a nightmare: his prime physique and legendary gear are gone, and he has been forcefully reverted to the appearance of a young boy. To make matters worse, the billions in wealth he risked his life to earn have been entirely stolen by the culprit.

Stripped of his body and fortune, most would despair—but not Kiren.

“You picked a fight with the wrong person.”

Infiltrating the elite academy controlled by the mastermind, the legendary hero re-enters the fray. Though trapped in a child’s body, his peerless combat instincts remain untouched. As the world’s greatest prodigy, Kiren sets out to crush his enemies one by one, reclaim everything he lost, and avert the impending “Apocalypse End” threatening all of mankind!