http://www.mangago.me/read-manga/asanaga_fuugetsu_shodouka_desu/bt/v01/c003/pg-7/
The art is Akira Norikazu's, it may be an unscanlated manga or an illustration (●'◡'●)ノ or I may be wrong ╮( ̄▽ ̄)╭ that's also a possibility LOL
http://www.mangago.me/read-manga/asanaga_fuugetsu_shodouka_desu/bt/v01/c003/pg-7/