Kotoishi, Yuuichirou

Yuuichirou is Naru's father. He works off the island and only visits once a year when he is allowed to take a few days off. However, he doesn't meet Naru, opting to leave her a toy airplane as a Christmas gift every year instead. When questioned by Seishuu, he admits that he avoids meeting Naru because having to leave her behind makes them both sad (Naru — to the point of running a fever).