When the protagonist wakes up, he finds himself in an erotic manga world where the idea of ​​chastity has been reversed. He transferred to a former girls' high school that had become co-educational, and he was the only boy in the school. Surrounded by a group of lewd girls who want to have fun, he becomes friends with the cool and dignified student council president, his sister who is a petite tsundere, a big-breasted otaku girl who covers her eyes, and a quiet girl with a cute face.

--This is the story of love and loneliness of that 'alone' boy.

* (R-18 Chapters are marked with a ♡ )