[Ponsuke] Onnanoko Kaika (Chibikko H) [Satoru]

Kaoru, a bold and cheeky tomboy schoolgirl with short hair and small developing breasts, boldly borrows a classmate's notebook as a pretext to seduce the shy Tsubasa, teasing him with her unexpectedly adult kissing before their curious study session escalates into a steamy, sweaty lesson where she eagerly takes the lead on top. When she discovers the success of a certain "study material," her arousal and enthusiasm only intensify, culminating in her breathless final moments as she takes him inside her trembling, virginal body.