Hirose Umi visits a pure virgin boy's apartment, where she initiates him with an under-the-covers experience in the cowgirl position. Despite her innocent appearance, she exudes an intense eroticism that easily captivates his heart. With a shy smile and adorable charm, she playfully teases him, completely dominating both his mind and body. While "cherry boy" evokes images of purity and innocence, she overwhelms him with a seductive allure that shatters that image entirely. This loving deflowering sex unfolds across four full chapters, highlighting the irresistible freedom of a younger girl's bold actions.