![3: 6+girls :d ;) ;d absurdres ahoge animal_ears artoria_pendragon_(all) artoria_pendragon_(swimsuit_ruler)_(fate) asymmetrical_hair bangs black_leotard blonde_hair blue_eyes blue_legwear blue_leotard blue_neckwear blush braid breasts bunny_ears bunnysuit d: detached_collar earrings fate/apocrypha fate/extra fate/extra_ccc fate/grand_order fate/stay_night fate/unlimited_codes fate_(series) feather_boa fishnet_legwear fishnets french_braid green_eyes green_leotard hair_ornament highleg highleg_leotard highres jewelry koha-ace large_breasts leotard long_hair looking_at_viewer medium_breasts miyamoto_musashi_(fate/grand_order) mordred_(fate) mordred_(fate)_(all) multiple_girls navel_cutout nero_claudius_(bride)_(fate) nero_claudius_(fate) nero_claudius_(fate)_(all) okita_souji_(fate) okita_souji_(fate)_(all) one_eye_closed open_mouth pantyhose peachpa pink_hair poker_chip ponytail red_leotard red_scrunchie saber saber_alter saber_lily scrunchie short_hair sidelocks small_breasts smile swept_bangs tiara white_leotard wrist_cuffs yellow_eyes rating:s score:58 post #3648826](/cdn_image/preview/19/1c/191c852935d5a9ad242248097b8aa62b.jpg)
From http://typemoon.wikia.com/wiki/Koha-Ace (more info there)
Koha-Ace (コハエース) is a parody manga by Keikenchi. It stars Kohaku and features characters from various TYPE-MOON series. It is drawn in a super deformed style, and it is a self-aware series that constantly breaks the fourth wall. Carnival Phantasm included segments based on the series, and it was the focus of the 2012 April Fools' Day joke.
This tag implicates fate_(series) (learn more).