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At the same time as entering college, Mitsuru lives at his aunt, Yumi's house, which he admires. However, the faint hope crumbles at the moment when I sneak a peek at my aunt's diary. What was written was that she shaved her hair as a proof of her single-minded feelings for the man she loved. What's more, she continues to shave even after the man leaves, and masturbates every night to increase her feelings. Feeling resentment that he can't fill the gap in Yumi's heart by himself, he spends his days in agony. However, unable to let go of his feelings for Yumi, Mitsuru takes a certain action.