Yuu, a fit high school student, has a crush on his teacher, Kyouko-sensei. He is enamored with her in every way, and after much trepidation, he decides to confess his feelings. Much to his surprise, Kyouko-sensei reciprocates his love and agrees to go out with him. However, Yuu is unsure of Kyouko-sensei's reasons for falling for him, and he is clueless about what she expects from a partner. Eventually, "Yuumi" is born after Yuu discovers Kyouko-sensei's preferences. He is now stuck between enjoying his newfound relationship or regretting it.
