At 152 cm and 44 kg, former adult high-school teacher Umi Hiroi looks slender, refined, and serious. Nervous but curious, she reacts sensitively to being touched on camera for the first time, stifling her voice until every deep thrust makes her moan and sends tremors through her body and breasts. Hours after her first filmed sex scene, she masturbates alone in her room. Her long-suppressed desire then spills over in a taboo threesome with adult student role-play partners, and she wonders whether she can ever go back. More than a debut, this is a small love story about a woman discovering what she truly wants.