Shunpei, visiting Tokyo for the first time in a while, finds himself increasingly drawn to his aunt Mako, who kindly offers him a place to stay. Keeping their relationship a secret from his mother, he becomes deeply captivated by her warmth and tenderness. Shunpei never imagined his aunt could be so pure-hearted and genuinely affectionate toward him. As their bond intensifies, an irresistible and forbidden development unfolds between them.