|Relatives||Serinuma Kae (Mother)
Mutsumi Asuma (Father)
Shion is a young boy who has eyes like his mother and hair reminiscent of his father's.
Kae is Shion's mother and seems to have a good relationship with her as they go shopping together along with his father at the end of the manga.
He goes shopping with him and his mother at the end of the manga. They seem to have a good relationship with each other.
- He has never seen his mother in when she was chubby, implying she looks like how she looks like after her transformation in the manga after giving birth to Shion.