Inaho-kun is supposed to be a fake girlfriend.

A new first-year student, Shintaro Mori, yearns for a sparkling high school life where he can have a girlfriend and be young, and is ridiculed by everyone around him. His classmate, Inaho Sawatari, who entered the school at the top of her class, is a beauty of the highest rank and is the center of attention. They are not supposed to be together, but when they are mistaken for a couple, she proposes... "Let's pretend we're really together, shall we?" They become lovers, but the beautiful girl turns out to be "a boy who is too cute"...!

A new first-year student, Shintaro Mori, yearns for a sparkling high school life where he can have a girlfriend and be young, and is ridiculed by everyone around him. His classmate, Inaho Sawatari, who entered the school at the top of her class, is a beauty of the highest rank and is the center of attention. They are not supposed to be together, but when they are mistaken for a couple, she proposes... "Let's pretend we're really together, shall we?" They become lovers, but the beautiful girl turns out to be "a boy who is too cute"...!