Onaji Zemi no Someya-san ga Sexy Joyuu datta Hanashi.

While taking a break from preparing a university seminar presentation, Ryosuke Kamiya stumbles across a video that reveals an unexpected secret about his classmate Ruka Someya. When he asks her about it in private, Ruka realizes that someone from her everyday university life now knows about a side of herself she has carefully kept separate.

Instead of addressing the situation calmly, Ruka proposes a deeply awkward personal arrangement to keep him quiet, leaving Ryosuke caught between curiosity, embarrassment, and boundaries he is unsure how to handle. As they continue seeing each other on campus and beyond, the real question becomes whether trust can grow from a situation that began with secrecy and fear of exposure.