Ayumu is a transfer student from Osaka, which is obviously where her nickname comes from. On her very first day of school, Tomo proclaimed that her name would be "Osaka" from then on, and as silly as it was, it stuck. Osaka is a bit, well, spacey. She transferred from her old school in Osaka because she felt she needed a new start, but it didn't really help. She still manages to focus her attention on floating dust particles rather than school work. Not the brightest of the bunch, but Osaka is still a sweet girl.

Seiyuu: Matsuoka Yuki

Resemblance: Mutsumi from Love Hina