As with a lot of the cosplay photos I’ve received from Japan’s Comiket 82 Event, I’m not sure who these colorful-haired girls are, but they’re really cute and adorable together!
I’ve cropped the original photo submitted, but you can see their full uniforms in the link. I hope someone will know the series at least, because I’m pretty sure I have another cosplayer in the same uniform, but she has short green hair!
Thanks again to Sean for sending this in!
EDIT: Thanks to Tsuji for letting me know these cosplayers are from the series, YuruYuri!