In the study room, Kio and Janu are left alone after their friends depart. Kio drops her "teacher's pet" persona, leading to a candid conversation where she admits that Janu has been on her mind. She expresses a desire to finally be intimate with him in the privacy of the study room, having previously struggled with hesitation. Janu confirms he shares her feelings, and they reach an agreement that if Janu’s relationship with Eruka were to become serious or committed, he will inform Kio so they can end their secret encounters to avoid hurting others.
After locking the door, the two engage in sexual intimacy, with Kio taking the lead. During the encounter, Kio confesses that she had accidentally lost her virginity previously while using a dildo, clarifying that she is "clean" for Janu. The scene culminates in Janu taking control of the pace, leading to Kio experiencing multiple orgasms before the pair rests. The event ends with Kio feeling exhausted and agreeing to handle the cleanup of the room, while Janu reflects on their physical development and his intention to continue their sexual encounters in the future.