Himari is distracted and flustered at school following a secret encounter with her teacher, Shun-sensei. However, she soon discovers that she isn't the only one involved with him when she learns of the intimate relationship between Sensei and her friend, Ibu. As secrets are revealed within the dorms, Himari must grapple with the tension and unfairness of their forbidden affairs.
Shun's forbidden relationships with his students intensify as he navigates secret encounters with Uesato and Ibu. After Ibu reveals her jealousy toward Himari, the tension reaches a breaking point in the school infirmary. What begins as a private moment between Shun and Ibu quickly evolves into a passionate three-way encounter when Himari reveals she has been watching them and joins in.