Isao Komori is a college dropout who spends his days alone in his flat enjoying video games and masturbating. Because going out and meeting people is not his type in Inside Mari Manga. He just stays isolated and enjoy his life in one room.
The highlight of his day is visiting a store wherever an angel like high school woman known as Mari visits nightly. One morning Komori wakes up in Mari’s body.
Another “Komori” inhabits his previous body and Mari gets disappeared. Komori faces difficulty to take care of Mari’s normal life and starts to research Mari’s disappearance. Maybe Mari wasn’t there fore innocent and excellent once all?