Indeed. Frau has been the first character I haven't liked in this series. Aki makes up for just about everyone else's minor foibles.

The store owner, she was paralyzed 15 years ago in an accident. At first I thought that would have put her in the same age range as Aki's sister, but Misaki seems younger than that. Unless it happened in middle school or something, when Kaito and Aki were still toddlers.