At the same time as entering college, Mitsuru lives at his aunt, Yumi's house, which he admires.However, his faint hopes crumble the moment he snoops on her aunt's diary.She was written that she had a single-minded love for the man she loved and that she shaved her head as a proof of that.Moreover, even after the man left, she continued to shave, and masturbated every night to increase her feelings.He spends his days frustrated because he can't fill the void in Yumi's heart.However, unable to let go of his feelings for Yumi, Mitsuru takes a certain action.