Yoshikawa, who moved into a condominium to attend university, harbored feelings for Mizuki, the married woman living next door. Shy and homely by nature, her beautiful face paired with glasses completely captivated him. One night, Yoshikawa's doorbell rang. When he opened the door, Mizuki stood there—glasses off, breasts swaying, and acting completely out of character. Before he could react, she gave him a blowjob. The next day, he confronted her, only to learn that it was the doing of her alternate personality, 'Mizuki.' As this strange situation unfolded, Yoshikawa's heart grew increasingly unsettled.