Ao, with a cool and kind personality, is known as the most handsome prince in school. His childhood friend Haru, is one year older than him. However, Ao, who's secretly in love with Haru, feels lonely because they're in different grades. Meanwhile, summer vacation begins, and when the two boys are curious about a kissing scene they see on TV; Haru suddenly blurts out, "I wonder what kissing feels like?"... Their relationship begins to change.