Inmon Kaika

Haruki Ariake, the son of a yakuza boss, had no intention of succeeding his family and kept a distance from his father. When his father was killed by a rival group, Haruki is captured by Hideto Mochizuki, who claims to be a mysterious doctor. He claims to be Haruki's mentor and pushes him down. Haruki wants to resist, but his lower abdomen has a special lewd crest, and his body begins to react just by being touched...!