Danjo no Yuujou wa Seiritsu suru?

Two years ago, at a rural junior high school, a boy and a girl made a solemn vow of eternal friendship. Now in their second year of high school, Inuzuka Himari—a young woman who has yet to experience her first love—and Natsume Yuu, a gentle boy with a deep passion for flowers, remain inseparable best friends. Spending their days together in the gardening club, their bond is comfortable and familiar, though occasionally punctuated by Himari’s playful teasing. She often jokes about the future, telling Yuu that if he never finds someone to marry, she will have to take the blame—especially since her older brother has already started calling him "brother-in-law." For a time, their relationship flows smoothly without complication. However, everything changes when Yuu unexpectedly reunites with his first crush from the past. This sudden reappearance sets the wheels of their dynamic in motion, disrupting the peaceful status quo they had carefully maintained. As Yuu’s attention shifts, Himari finds herself confronting unfamiliar emotions. Faced with this new reality, she must determine whether her newly awakened feelings are strong enough to help her finally break free from the confines of being just his ideal friend.