A man without a name who was doing slaughter in Japan, accidentally died without permission one day. But when he awoke he was a dragon in a different world. The man thinks.
That, you do not have to work on this?
Both the demon king and the brave became the strongest creatures at a toothless level, so it was a man who decided to live on leisurely as he liked.
it's introducing mecha elements in the series to defeat new kind of enemies