Tsubasa Miu♀

Miu is a girl that met Yuuta ten years before the story begins, as the daughter of a family that had just moved into the town of Tokimori. Miu and Chizuru get along extremely well and compliment each other through their naturally playful personalities. In general, Miu can be thought of as a simple person, finding joy and fun in things that the other members of the cast shrug off. At the same time, she is very insightful and likes to stay under the radar when it comes to what she knows. Her lack of understanding when it comes to certain things lead to comic situations that put our protagonist on the spot, as well.

[From Moroboshi Yuumei's review]