[Yamamoto Naoki] Saishin sakuhin-shū dai ichi hen: Renshū | New Series Vol. 1: Practice [Rainash]

A confident schoolgirl challenges a classmate to rock‑paper‑scissors, leading to a provocative encounter with several male peers. She guides the group through intimate actions, using whispered instructions and physical contact that heighten the tension and desire. The story escalates into a series of explicit, consensual exchanges that explore the characters' relationships and the thrill of forbidden play.