Yuji Fujiwara has been living an unfortunate life. When he was a child he was blamed for breaking a vase, younger he was fired from his company for a colleague’s mistake. Now, at the convenience store where he works, he was blamed by Takamiya, a girl younger than him, for his own mistakes. Fujiwara, sad and depressed, returns home only to be greeted by a strange girl. She deforms and reveals his true identity, a slime that has been living with him for the past three months.
The creature, which speaks human language and can change its appearance, becomes attached to Yuji, although he is not very fond of the slime’s favors. To attract Yuji’s attention, this life form transforms into Takamiya, the evil coworker, and seduces him.