Artist, [[NicoNico]] user.

Japanese name: "温泉卵 (Onsen Tamago or Onsentamago)":http://tangorin.com/general/%E6%B8%A9%E6%B3%89%E5%8D%B5 
Name as a doujin artist: "喜怒哀楽 (Kido Airaku or Kidoairaku)":http://tangorin.com/general/%E5%96%9C%E6%80%92%E5%93%80%E6%A5%BD 
Circle name: ぬるま湯温泉 (Nurumayu Onsen)
onsen tamago (nurumayu onsen)