Shy and reclusive girl Kana finds a man collapsed on the street and takes him back to her room. Unused to interacting with men, she's so innocent that even a simple kiss leaves her completely drained. But as days pass, she gradually changes. Tempted by the man and growing bolder—sometimes masturbating in front of him when drunk—she develops a lustful side, teasing him until he can't hold back. Her personality brightens, and her life begins to improve. Watching her transformation, the man passionately makes love to her one final time, climaxing inside her bare before they part ways.