Uenoyama realizes he's envious towards the conclusion of chapter 6, when Mafuyu tells him about a "failed prior love." In chapter 13, Mafuyu admits his affections to Uenoyama, and they begin dating in chapter 14. However, she doesn't tell him about her previous love interest until later. Mafuyu is one of the main characters in Tantei Opera Milky Holmes. She lives in a small town in Japan with her father who owns a detective agency. She has an elder brother named Tomoe who works at the same detective agency as their father. She also has two pet cats named Shirley and Bob-Omoby. In addition to being a detective herself, Mafuyu is also a skilled cook. This is evident by the fact that she was able to solve several cases while still working as a teacher during school days. She resigned from teaching to work with her father full time after hearing about a case involving a child murderer. Initially, Mafuyu refused to give up on her dreams of becoming a police officer like her father but eventually gave in when he decided it was for the best. She then left home to study abroad in Switzerland for three years. During her stay there, she met many new friends and even fell in love once before returning home.