Rintarou Amano has come to accept that he will have to care for his inept childhood friend Maki Nakatsugawa indefinitely, since they are now university students living under the same roof. However, things take an unexpected turn when Maki, who was previously innocent and virtuous, starts relying on Rintarou to satisfy his sexual desires. As the newly found deviant becomes aroused at the mere sight of Rintarou, the latter is faced with a difficult decision: to set boundaries or uncover his true feelings for his friend.
