He is an assassin associated with Yugang, a Chinese organization.

Juuzou Oogami is a legendary hitman who has never failed an assignment, no matter how impossible. One day, after wiping out a powerful organization, he is stung by a mysterious wasp and collapses. When he wakes up, the fearsome 39-year-old assassin has been transformed into a 13-year-old boy! 

Before he can even process what happened, his boss delivers a new order: “In that body, infiltrate a middle school.” 

What awaits him is an unexpected school life filled with colorful classmates, youthful chaos, and looming danger. Can Juuzou ever return to his original form? Or will the assassins closing in on him end his second life before it even begins!? 
(Source: Official Site)

[Twitter](https://x.com/SAK_SAK_SAKUMA)

Sakuma is a member of Johnny & Associates' boy idol group Snow Man.

Juzo Ogami’s a legend. Even among hit men, his name sends shivers down spines. There’s never been a job he couldn’t handle—that is, until the day he wakes up as a teenager! But how has his body transformed? To find out, he’ll have to infiltrate the one place he thought he’d never find himself in again…school!
 
(Source: VIZ Media)

Shin Kohazame