Asobe Mi Lumi (Kenichi Matsuyama), a student at the School of Fine Arts, is attracted by the new printmaking teacher Zhu Xiong Lily (Hiromi Nagasaku). He soon had a relationship with Lily and fell in love with her because of Lily's mature charm and unruly personality. Xiaoyuan (Aoi Yu) is a good friend of Mi Lumi and has always been secretly in love with Mi Lumi. She was greatly stimulated by the unethical relationship between Mi Lumi and Lily. When the innocent Mi Lumi visited Lily's house, she learned that Lily was already married and her husband was a sloppy old man. Shocked by reality, Mi Lumi decided to break off relations with Lily, but he could not forget Lily at all and could only struggle alone at home. Xiaoyuan, who could not see past it, decided to help Mi Lumi and Lily. However, the world of adults is beyond the imagination of these young children. Lily suddenly disappeared in everyone's life, just like her sudden appearance.