Hiroe Ogawa, a physically robust high school athlete with no prior health complications, navigates adolescence burdened by an elusive pursuit: achieving orgasm despite ordinary sexual drive and sensitivity. Frustration fuels relentless experimentation—solo attempts, hypnosis sessions, and partnered encounters—all ending in dissatisfaction. Her housemate Mayaka’s hypnotic intervention backfires, linking Hiroe’s climaxes exclusively to Mayaka’s touch, sparking awkward dilemmas. Undeterred, Hiroe tests a lab-made "Ultimate Sex Machine," but her body resists its mechanisms, triggering catastrophic failure.

Same-sex explorations with classmate Takami yield no breakthroughs. A supernatural twist emerges when demonic possession morphs Hiroe into a futanari, driving involuntary acts until an exorcist banishes the entity. The demon’s封印 leaves her original plight intact. In her relationship with boyfriend Sumio, Hiroe masks unrelenting frustration by feigning satisfaction, shielding him from her secret struggle. Allies like landlady Yayoi and the exorcist join Mayaka and Takami in seeking solutions, yet progress remains fleeting.

Sporting blue hair, gray eyes, and a youthful demeanor, Hiroe channels athletic tenacity into her quest, weathering humiliating mishaps and ephemeral hopes. Her story closes without resolution across manga and OVAs, lingering on her resilience amid a cycle of trial, error, and unchanging reality.