Seigi Nakata/Relationships

Richard Ranashinha de Vulpian
In the novel, there are moments where Richard and Seigi seemingly flirt with each other that they are often mistaken as a romantic couple by others. Their relationship is very close as they are able to say how much they like each other in both the anime and novel, however, it is unknown whether they mean it romantically or platonically.

Shouko Tanimoto
Shouko is Seigi's friend and crush where they first meet each other at the crossroad when Seigi stops her from being tricked by a perverted old man. She has a big love for minerals and thus she usually helps Seigi know more about the gems he comes across in Richard's shops.

Hatsu Kanou
He loved his grandmother, and continued to do so even after finding out her true occupation.

When his karate training was over, he would change trains to go and play at his grandmother's apartment. To him who didn't know much about dementia nor understood it fully, living with her was like a dream. She was like a hero to him.

Hiromi Nakata
Seigi describes their current relationship akin to that of war buddies. He saves his mother's name as "Hiromi" in his contacts, and even refers to her by her first name.

He went through his "dark" rebellious phase and his high school years like doing a three-legged race on a long bumpy road. He thought he contacted his mother and returned home more frequently than university students with their mothers anywhere. However, it didn't feel like they were poking their noses in one another's business in various ways. He often went back to the family home. It was because he thought it was better for crime prevention, when a young man frequently visits the apartment of a lone woman who tended to be away from home.

He called her "demon witch" in middle school. He also described her as an "awful person who acted self-important, even though she tended to be away from home".

However, after his grandmother's case, the two dined together in his mother's house. He also helped the latter come into terms with her feelings towards his grandmother.