栗山 兎鞠

Neighbors with the protagonist growing up, and of the same age. As a child, she was a crybaby always crying and depended on the protagonist to take care of her. In reaction to this, she wants to repay the protagonist by taking care of him now that they have reunited. She treasures a hairpin that the protagonist gave her before moving away.

"If you tell me, I will pamper you as much as you want."