Kei, a high school teacher who has never had a girlfriend, is secretly feeling lonely because Touma, his neighbor and student who has always been like family to him, has become cold towards him as he grows up. One day, by chance, Touma finds out that Kei is interested in men. Suddenly, his behavior changes drastically, and he approaches Kei as if his previous cold attitude was a lie...!? What does "I've always loved you" mean? I've always thought of him as my younger brother, and I know I shouldn't do something like this with an important student, so why am I excited about Touma, who has become so grown-up and handsome...? The younger guy's all-out approach just won't stop! The erotic and exciting youth life of a handsome high school boy who lives next door and a teacher with no dating experience!