As Sakuta approaches the end of his second year in high school, he faces the looming reality of limited time with Mai, a senior student. Simultaneously, his sister, Kaede, who is gradually exploring the outside world, surprises him with her bold aspiration to attend his high school. Sakuta grapples with the challenge of supporting Kaede in her ambitious endeavor, uncertain if it aligns with her true desires or if it's in her best interest.