Danbooru-based image board with a specialization in high-quality images.
cosplay fukuzawa_yumi joe k-on! maria-sama_ga_miteru seifuku shimazu_yoshino torii_eriko toudou_shimako

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The radishes are a definite giveaway that this is a K-ON! spoof of some kind. Don't know if these are the actual Houkago girls or some characters from another series that are meant to portray them though.
The characters are from maria-sama_ga_miteru but as you said it is a K-ON! spoof.
I lol'ed at takuan pickles.