A shy high school student named Yuu Kazama has been in love with his beautiful big-breasted homeroom teacher Misaki for a long time. One night, he gathers his courage and visits her apartment to confess his feelings. Misaki is surprised but eventually gives in to his emotions, leading to their first passionate encounter with deepthroat, paizuri, raw sex, and creampie. The episode ends with them beginning a secret forbidden relationship