Asuka Kaminogi

Asuka Kaminogi is Haruka's mother. She is often spaced out; for example, late in the series, she doesn't realize her daughter has disappeared until her whole house vanishes. She was once best friends with Yuu's mother, but their friendship eventually started to fall apart when Yuu's grandmother died. After Haruka and Miyuki visit the past, her friendship with Miyuki re-affirms itself.

(Source: Wikipedia)