A brief description of the manga Isekai Mahou Wa Okureteru!:
Suddenly there is a magic circle in our world. He transported the wizard Suimei Yakaga and his friends to a different, unknown world. Everything could have been good, but the hero who was called was his good and close friend, not him. Suimei only got there for company.
So he refused to fight against a demon ruler. Instead, he decided to go home and went looking for a possible way. In doing so, he used knowledge from modern magic. What kind of trials await Sammy? Let’s find out from the manga extension.
(Haven’t started the series) The Mc’s name is Sammy? Bruh 
I like when the MC gets serious and puts on the black suit
wow the mc badass, but after some chapter, he become powerless?
holy shit they really changed the commnent sections huh?
atleast they arent posting it and are working on other stuff. srry I dont like this so now they work on something better mebbe
How the hell are there so few chapters even after all this time? This was first released in 2016. This is too pathetic.
I honestly recommend to go and read the light novel insted.
That book, is full of overly complicated Fate/ like magic system, explanation of which are really long.
I kinda surprised that it even exist as a manga, but it is probably better to read some other manga, then read it.
I will also offer to read it after the novel, as it is cute.