Ryuu Yamato

Kazuya Niimi, a student at a music university, is known for having "immobile fingers"—hardly fitting for someone aspiring to be a pianist. One day, due to a sudden twist of fate, Kazuya finds himself lost in another world. In this strange new world, men are not treated as people—it is a society of overwhelming female supremacy and male subjugation. But in that world, Kazuya notices something strange happening to his body. His fingers now hold a mysterious power. Fingers that cause anyone they touch to physically react.

One day Takumi, a university student who writes erotic novels on the side, is approached by his beautiful classmate Otoha Nodoka. She says that she's a fan of his work, then suddenly shows him a video of herself masturbating and asks him to help her become successful as an amateur porn star

What if I had accepted her confession back then…? Could I have saved her?” Hiroki Majima, a plain and pathetic middle-aged man, is overwhelmed with regret after learning of the death of his first love, Ryouko Tokiwa. Lost in his remorse, he suddenly finds himself transported back in time to 1997—right at the moment when a young Ryouko is confessing her feelings to him. Without hesitation, Hiroki accepts her confession and vows to make the most of this second chance at youth. But what began as a dream come true quickly turns into a nightmare when a tragic event drags him into a dark, controversial, and utterly inmoral mission.