Udagawa (宇田川 Udagawa?) is the manager of a café shop and owner of a boarding house who was Yuzu Aihara's boss when she was working part time. Initially introduced as a simple cafe owner, it was revealed later that he is the second son to a wealthy family. Due to his older brother inheriting the family business, he was able to live his life making his own choices and living freely. However, due to circumstances with his family, he needed to marry in order to further strengthen business opportunities for the company.
Udagawa has brown hair thick eyebrows wears glasses, typically at wearing his cafe waiter uniform consisting of a black vest over his tie.
During his with meeting Mei Aihara, he slicks his hair to the side and wears a suit.
Udagawa is a gentle and kind guy towards others that he even lets Yuzu say what she needs to say to Mei, even though Mei refuses to listen to Yuzu. From his meeting with Mei to establish the arranged marriage, he mentioned how he typically does not deal well with the strict atmosphere of his home and his family's business.
- The surname Udagawa means "eaves, roof, house, heaven" (宇) (u), "field, rice paddy" (田) (ta/da) and "river, stream" (川) (kawa/gawa).
- According to Mei's grandfather, Udagawa is very experienced in business management where he was known to be a top student.