Rui Fucks His Little Bestie Shion

The "gender-swap romantic comedy" centers around Shion Chihara and Rui Chihaya, two tight college friends who are unrivaled in picking up women. One day, Shion is given a drug by a mysterious woman and wakes up in a woman's body. It was love at first sight for Rui, despite not initially realizing that this woman before him is actually his best friend Shion. When Shion returns to being male, they continue fucking.