One day, a high school student, Minorikawa Narumi, is suddenly thrown into a yakuza family and begins a life as a “young master".

As he spends time with his caretaker, a young henchman named Imokura, he is swept away by the charms of an “adult man” that he feels for the first time.

Even after realizing that they are in love with each other, their age difference remains a barrier to progress, but gradually the distance between the two grows closer.