Demon King Daimao
いちばんうしろの大魔王 (original)
Demon King Daimao follows Akuto Sai as the lead character, who on the day he enters Constant Magic Academy, receives a very unexpected future occupation aptitude test result: “Demon King.”
Starring Takashi Kondo, Yoko Hikasa, Aki Toyosaki, Aoi Yuki, Tsubasa Yonaga, Shizuka Itoh, Chiaki Takahashi, Ryo Hirohashi, Ayana Taketatsu, Kaoru Mizuhara
It's a animation and action & adventure show, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United Kingdom.