Shinozaki-kun no Mente Jijou is a Manga/Manhwa/Manhua in english language, COMEDY series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Shinozaki, an ordinary office worker recently worried about being "off his head", is approached by a woman named Yuyake. She explains that her magician grandmother modified his body in the past…causing him to have a lot of inside machinery?! He'll have to receive internal maintenance from Yuyake… A slightly wobbly magical remodelling life between a very ordinary salaryman, Shinozaki, and an enigmatic magician, Yuyake, begins.