絶対にときめいてはいけない！

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. (Unreviewed summary by Grok 2)