Danbooru-based image board with a specialization in high-quality images.
hanamaru_youchien motomura_kouichi seifuku tsuchida_satsuki

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The one on the middle right looked like kasuga_ayumu to me, at least in the thumbnail.
Yeah I thought so too. I haven't heard of this show / manga. Looks like a few chapters are translated, but I'm not finding much info on a subbed version of the show.
I did find a surprisingly still active torrent for it over on nyaa