Shino-sensei is known as a cold and professional educator, but her composure shatters when she encounters her student, Fujiwara, alone and bruised in the rain. What begins as a misguided attempt to comfort him leads to a forbidden sexual relationship, awakening Shino's own repressed desires and masochistic tendencies. Finding a passion with Fujiwara that has been missing from her distant marriage, Shino begins risking her career by engaging in secret, illicit encounters within the school.