Yuji Fujiwara lived a quiet life. She was blamed for a vase she didn't break, and her co-worker's mistake led to her being fired from her company. At the convenience store where she works part-time, she is blamed by Takamiya, a girl younger than her, for mistakes made by others. When she returns home feeling depressed, she is greeted by a strange girl. The girl reveals her true identity to Yuji who is confused. She said it was a slimy creature that had been living with her for three months. She is a creature who speaks human language and can change her appearance and has a crush on Yuji. Yuji is curt about her kindness toward the slime lifeform. In order to attract Yuji's attention, her slimy life form changes her appearance and seduces Takamiya, her colleague at her part-time job. Contains "Episode 1" from the original "Mucus Living Together"