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Sanae's sister who managed to get enrolled in the upper-class school before her family's fortune went bust.
Fitting the ecchi archetype of the completely shameless character that strips for no reason. It could either be because she is trying to show off, or it could be because she is really stupid and takes things literally. Such as one time when Akiharu comments in disbelief on her being Sanae's sister, and why Saori is in the upper class and Sanae in the maid class, Saori claimed that time that she thought that Akiharu was saying that she and her sister should be wearing the same outfit, hence her reason for stripping. She also seems to wear loose clothing on purpose, as in a sports event when crawling under a net only her clothes get dragged off by the net, following which she sits under the net like an idiot, in only her underwear.