In middle school, Nao Kogure once left an umbrella and a box of bandages for a wounded delinquent she was too scared to approach. Two years later, on her first day of high school, that same boy—Taiga Onise—summons her to the rooftop, presents her with a bouquet of flowers, and asks her to date him with marriage in mind. Terrified of his intimidating reputation, Nao accepts out of fear, but her guardian, her uncle Sou, advises her to give him a real chance. As she spends time with Onise, she discovers that beneath his scary exterior lies a gentle, honest, and surprisingly formal young man who is misunderstood by everyone.

Nao initially believes she is in love with Sou, but as she gets to know Onise, her feelings begin to shift. The two agree to be friends first, and over the course of their first year, they forge a close bond alongside a small group of classmates: the reserved and beautiful Kayo Yashiro and the sharp-tongued Ayumu Misaki. Together they navigate school life, from an inter-class field trip and a sports festival to study sessions and quiet moments that deepen their connection. Onise’s first kiss wakes Nao to her real feelings, and soon she confesses that she wants to date him. With Sou’s blessing, they become a couple.

The story follows their relationship as it blossoms through everyday high school experiences. New characters appear, notably the popular and friendly Ayaha Futami, who becomes close to Onise and briefly stirs Nao’s jealousy, and later the quiet transfer student Miyabi Nishigaki, who develops a one-sided crush on Onise. These challenges test the couple’s trust and communication, but Nao and Onise consistently work through misunderstandings by talking openly and supporting each other. Meanwhile, their friends Yashiro and Misaki grow closer, and Sou’s own romantic history surfaces, leading to moments of reflection for everyone.

The narrative spans high school from first year to graduation, culminating in a time skip that shows the characters as adults, having grown into themselves while maintaining the warm bonds forged in their youth. The series is a gentle, slice-of-life romance that emphasizes mutual respect, clear communication, and the sweetness of discovering someone’s true self beyond appearances.