This is Japan, the peaceful country I once admired, so why am I embroiled in such trouble…” Sato Taro, who works at the long-established confectionery company Suirendo, harbors a secret. In fact, he was once a feared and strongest former mercenary! After the destruction of his organization, Sato ended up in Japan, where he works as an office worker hiding his identity, but one day he gets caught up in a serious incident… An exhilarating battle comedy about a former mercenary and the strongest office worker!