When Aoki Daisuke began teaching a new 3rd grade class, he never imagined the unexpected challenge that lay ahead. Despite a rough introduction with the entire group, one student named Rin Kokonoe is won over by Aoki's kind gesture. She becomes infatuated with her new teacher and sets out to win his affection. But Aoki is unsure of Rin's true motives and wonders if he should help her control her desires.