Danbooru-based image board with a specialization in high-quality images.
adlib_software ageishi_kokona doko_no_donata_no_kanjou_keiro megane miharu_abe misato_fujiwara moododan ootomo_tsubasa pantyhose sayaka_ishizukuri seifuku thighhighs

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The artist is "Moo℃団". It's said "Moo℃団" is 渡邊義弘(character designer of "boku wa tomotachi ga sukunai")
Original character designer for Hagane is Buriki.
Watanabe Yoshihiro is the one that did it for the animation.
”ゲーム原画を担当することもあり、その時の名義はMoo℃団である。”
Source: http://ja.wikipedia.org/wiki/渡邊義弘_(アニメーター)#.E6.9D.A5.E6.AD.B4.E3.83.BB.E4.BA.BA.E7.89.A9
Don't change it until one of them officially said so.