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Vol. 1, May part 1, p. 25 - 32 of the Omnibus: "Yukari Commutes By Bike" to "The Test".
That picture before the first strip bugs me, and I think it's because her arms were made too short.
Favorite: "Huh?"
For fans of Osaka, this is the chapter where she comes in, though she's not called that yet, nor does she exhibit her odd thought processes.