

He is ridiculed and coerced into doing Shusuke's dirty work, and finds solace only in the ethereal music Lily Chou-Chou makes, and acting as web editor for his fan website. Yuichi, the confused and shy former friend of Shusuke, finds himself sucked into his now-tormentor's gang. An alternative voice, that of the character Sumika Kanzaki, attributes Shusuke's personality change to the collapse of his family's business and his parent's divorce this matches several scenes connecting the decline of Shusuke – who has had to change his name – to divorce. Back at school in September for second term, he takes his place as class bully and shows his newfound power by ruining the lives of his classmates. Once there, Shusuke has a traumatic near-death experience and his personality changes from good-natured to dangerous and manipulative. The kendo club summer camp training is tough, and Shusuke, Yuichi and some other first-grade boys decide to take a trip to Okinawa. Yuichi mistakes Shusuke's attractive young mother for his sister. Shusuke's family is wealthy in comparison to Yuichi's family.

Shusuke and Yuichi meet and become friends when they join the kendo club, and Shusuke invites Yuichi to stay over at his house. In elementary school, Shusuke was one of the best students in school, but was picked on by his classmates. The film has a discontinuous storyline, starting midway through the story, just after the second term of junior high school begins, then flashes back to the first term and summer vacation, and then skips back to the present. All About Lily Chou-Chou follows two boys, Shūsuke Hoshino and Yūichi Hasumi, from the start of junior middle school when they first meet, and into the eighth grade.
