In this chapter, we are introduced to a third-year student named hinakokawawa, who is in her last year at middle school and is going to attend a boarding school with her older sister, sakukawawa. . The narrator introduces us to sukukawawa's younger sister, Riko, who will be attending a high school in a different part of the country. Riko is a bully, but she is also a good friend of sakurakawawa and is very fond of her younger sister .