Hime

The granddaughter of the president of the company that the protagonist's parents worked for. She calls the protagonist "onii-chan" and acts like a spoiled baby ever since he taught her how to fold paper airplanes. Whenever she encounters the protagonist, she secretly follows him to the apartment complex and the church and causes commotion.

Spoiler

Hime real name is 姫光空 (Hikari Sora). At first she hate to called as Sora so she use ヒカリ (hikari) to make other people call her. But yuuhi give her nickname and called her Hime as their friendship.