a_channel acchi_kocchi afro animayell! anne_happy aoki_ume arai_cherry bikini blend_s business_suit cheerleader chiba_sadoru chiya_(urara_meirochou) cleavage cloba_u comic_girls cotoji crossover doujin_work ga_geijutsuka_art_design_class gakkou_gurashi! gochuumon_wa_usagi_desu_ka? hanakoizumi_an hanayamata hanzawa_kaori hara_yui harikamo harukana_receive hatoya_kohane hidamari_sketch hirasawa_yui hiroyuki honda_tamaki hoto_cocoa ichii_tooru ichinose_hana ishiki iwami_shouko joukamachi_no_dandelion jpeg_artifacts k-on! kakifly kanamemo kasuga_ayumu_(artist) kawai_makoto kazuho kill_me_baby kin'iro_mosaic kiyuduki_satoko koi koufuku_graffiti kuroda_bb machiko_ryou magic_of_stella maid manga_time_kirara megane merry_nightmare mikami_komata miniwa_tsumiki moeta_kaoruko nakamachi_kana nakayama_miyuki new_game! nishikawa_youko nonohara_yuzuko nyoi_jizai oomiya_shinobu oozora_haruka open_shirt osana_najimi pantyhose sakura_trick sakurada_akane sakuranomiya_maika sansha_sanyou seifuku sekiya_naru shima_rin slow_start sonya_(kill_me_baby) sou suzukaze_aoba sweater swimsuits tachi_(gutsutoma) takayama_haruka takeya_yuki thighhighs tokumi_yuiko tokunou_shoutarou uniform unohana_tsukasa urara_meirochou ushiki_yoshitaka waitress yamaguchi_kisaragi yumekui_merry yuno yurucamp yuyushiki

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I tagged all the girls I recognize, here's the full list with [Unknown] for the ones I don't know, all rows going from left to right:

Top Row: [Unknown], Sakuranomiya Maika (Blend S), Oozora Haruka (Sakura Trick), Hirasawa Yui (K-On!), [Unknown], Oozora Haruka (Harukana Receive)
Second Row: [Unknown], [Unknown], Hoto Cocoa (Gochuumon), Yuno (Hidimari Sketch), Chiya (Urara Meirochou), Ichinose Hana (Slow Start), Oomiya Shinobu (Kiniro Mosaic)
Third Row: Sekiya Naru (Hanayamata), Takeya Yuki (Gakkougurashi!), [Unknown], Suzukaze Aoba (New Game), Sonya (Kill Me Baby), Shima Rin (Yuru Camp), Hanakoizumi An (Anne Happy), Hatoya Kohane (Anima Yell!)
Bottom Row: Nonohara Yuzuko (Yuyushiki), Merry Nightmare (Yumekui Merry), [Unknown], Ichii Tooru (A Channel), Miniwa Tsumiki (Acchi Kocchi), Honda Tamaki (Magic of Stella), Kaoruko Moeta (Comic Girls)
1st Unknown: Machiko Ryou (Koufuku Graffiti)
2nd Unknown: Nishikawa Youko (Sansha Sanyou)
3rd Unkown: Osana Najimi (Doujin Work)
4th Unkown: Sakurada Akane (Joukamachi no Dandelion)
5th Unknown: Yamaguchi Kisaragi (GA Geijutsuka Art Design Class)
Last Unknown: Kana Nakamachi (Kanamemo)