Based on the manga of the same name by the popular Shirataki Shun manga. The main character of hentai Koizumi-kun is crazy about his fellow student Rin-chan, but with his perverse character and habits, he does not even cherish hopes of reciprocity. However, Rin herself has also long been in love with our hero and only shyness prevents the girl from admitting this to her beloved. By a strange coincidence, Koizumi saves Rin's best friend Kumi from being raped. And she, as a token of gratitude, well, you understand ... What awaits our hero next, look and find out ...