Ikushima's Senpai

She is a third-year high school student of Prefectural Sanada East Girl's High School and an upperclassman of Ikushima. She, Yanagi's Senpai, and Habara's Senpai were classmates when they were in their third year of grade school. She later confessed to Ikushima that Yanagi's Senpai and Habara's Senpai's conflict began when they were suspected of stealing her lunch money which was actually left at home. After years of spinelessness, she revealed the truth to her friends with grim determination, and was able to reconcile with them.