After school is over, Yumi's classmate Tsutako Takeshima meets with Yumi to show her that she took a photograph of Yumi's meeting with Sachiko earlier that morning. Yumi asks if she can have the photo, but Tsutako says she will give her the snapshot under two conditions: one being that Tsutako can display it at the upcoming school festival, and two being that Yumi get Sachiko's permission to do so as well. Yumi agrees to this, which sets in motion a series of events involving the entire Yamayuri Council. A few weeks after first meeting Sachiko, Yumi accepts Sachiko's rosary and therefore agrees to become her "petite sœur". This officially inducts Yumi into the Yamayuri Council where she assists them in school matters alongside Yoshino Shimazu and Shimako Tōdō—the "petite sœurs" of Rei Hasekura and Sei Satō, respectively. Through her activities in the Yamayuri Council, Yumi becomes closer to the other members and generally finds her experiences with the group to be enjoyable.