薫る花は凛と咲く 3 by Saka Mikami

Rintaro Tsumugi, a student at the low-tier Chidori High, and Kaoruko Waguri, from the distinguished Kikyō Girls, feel comfortable together as they spend time with each other. Their closeness grows, but the social barrier between the neighboring schools is high, and Rintaro cannot tell his Chidori friends. That hidden secret produces a misunderstanding. After much anguish, Rintaro calls Kaoruko and her friend Subaru Hoshina to meet after school.