Tenshi no Kokoro de

A gritty action-crime saga set in the underworld of the Yakuza, this story centers on an unlikely protagonist—an ordinary housekeeper. During his high school days, Takashi Nagumo was set upon by street thugs, only to be rescued by a remarkably formidable young man named Ryuusei Kuragano. Three years later, Takashi has built a quiet life as a domestic worker, but his world is upended when he becomes entangled in his friend's dire financial crisis. Fleeing with a massive debt, the friend leaves Takashi as his guarantor. In retaliation, the Yakuza drag Takashi to their headquarters and force him into servitude as a housekeeper at the residence of their clan leader, where he is to remain until the fugitive friend is located. Upon arriving at the estate, Takashi comes face to face with Ryuusei once more...