a_channel acchi_kocchi animayell! anne_happy bikini blend_s business_suit cheerleader chiya_(urara_meirochou) cleavage comic_girls crossover doujin_work ga_geijutsuka_art_design_class gakkou_gurashi! gochuumon_wa_usagi_desu_ka? hanakoizumi_an hanayamata harukana_receive hatoya_kohane hidamari_sketch hirasawa_yui honda_tamaki hoto_cocoa ichii_tooru ichinose_hana joukamachi_no_dandelion jpeg_artifacts k-on! kakifly kill_me_baby kin'iro_mosaic koufuku_graffiti kuroda_bb magic_of_stella maid megane merry_nightmare miniwa_tsumiki moeta_kaoruko new_game! nonohara_yuzuko oomiya_shinobu oozora_haruka open_shirt pantyhose sakura_trick sakuranomiya_maika sansha_sanyou seifuku sekiya_naru shima_rin slow_start sonya_(kill_me_baby) suzukaze_aoba sweater swimsuits takayama_haruka takeya_yuki thighhighs uniform urara_meirochou waitress 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)