Shino Mamiya lost her husband and raised her son alone. Her son, who never properly knew his father, grew up as a NEET, and Shino has become overly attached to him. Though his body appears adult, he still looks childish. Recently, however, Shino begins seeing her late husband's image in her son's figure, and as she gazes at him, the sexual pleasure she had nearly forgotten starts to awaken within her...