Series by 築島治

Sakura Nishiyama, a high school freshman, is thrilled at the prospect of gaining a younger brother through her parent's remarriage, eager for the warmth of a new family member. But her excitement turns to shock when she discovers her "little brother" is actually Kaede, a boy her age, who witnessed her recent heartbreak. Kaede's brusque demeanor initially puts Sakura off, but his unexpected kindness begins to blur the lines between family and something more. As they navigate life under the same roof, Sakura grapples with forbidden feelings and the complexities of their unique bond.

Makoto Sakurai has always been clear about one thing: she wants a boyfriend—but definitely not her childhood friend, Reita Kikuchi. Reita, a narcissistic and self-assured charmer, is popular with girls, but his overbearing personality grates on Makoto. That is, until one day, Reita suddenly declares himself her "boyfriend," throwing her plans into chaos. As the lines between their childhood bond and new feelings blur, Makoto finds herself navigating a whirlwind of emotions, misunderstandings, and unexpected sparks.

Hirahara Tsukasa moves from Hiroshima to Tokyo seeking a fresh start after past events left her with a tendency to cry easily. On her first day at high school, she accidentally causes four classmates to be late, drawing their immediate attention. Among them is Yoichi, who quickly develops a strong dislike for her, while Nozomi displays a mischievous charm and Chisai remains enigmatic.