First loves are always a little childish, but that's not what fifteen-year-old Kaho Nikaidou has in mind when it turns out that her mysterious new boyfriend is a fifth-grader! Kaho tells Kanade about her kiss with Atsushi. Any normal boyfriend would get mad, but Kanade only smiles back! Amid these complicated feelings, she ends up alone with Atsushi. Is this the start of a love triangle?