Kill Blue | GOGOAnime

Synopsis:

Juuzou Oogami is a legendary hitman who never fails in any mission, no matter how impossible it may be. One day, after eliminating a powerful organization, he was stung by a mysterious wasp and collapsed. When he wakes up, the terrifying 39-year-old killer turns into a 13-year-old boy!

Before he could even process what happened, his boss issued a new order: “In that body, infiltrate a high school.” What awaits him is an unpredictable school life filled with colorful classmates, youthful chaos, and imminent danger. Will Juzo be able to return to his original form? Or will the assassins closing in on him end his second life before it begins?