Suzushiro Mizuki is a first-year high school student who struggles with constantly being mistaken for a girl. The situation is so severe that he is endlessly turning down confessions from many men. Even the girl he has a crush on seems to view him more as one of the girls rather than as a potential romantic interest. Meanwhile, the trickster god Loki has grown bored with playing her tricks on her fellow gods. Turning her attention to the mortal world, she targets Mizuki for her next round of fun. The result: Mizuki wakes up with budding breasts and a missing part of his anatomy. What else is in store for Mizuki and how will he deal with it?