Shō used to be a teacher at the Aihara Academy, and married to Mei's Mother. However, he and his wife divorced, and eventually he resigned his position as a teacher and left Mei in his father's care in order to travel the world. However, he says he pampered Mei a lot as a child.
Shō was first mentioned in Chapter 1, after Yuzu returns home after her first day at her new school. She asks her mother if her new father is already home, only to learn from her mother that "he left to see how is the other of Earth" and won't be back for some time. He is later mentioned by name when Mei introduces herself to Yuzu's mother.