Shaikh_Tohaa
I just think of his past the same as this one novel where the MC got summoned back to the world he already saved. He stopped the first war that the Demons and Beastmans was against the humans. The humans started the war because they were greedy. He did it by getting in a relationship with The Demon King(Female) and the Princess of Beastmen and getting their races acknowledgment. Their were Two heroes summoned and the other was a huge yandere( plus a dude) so he sided with the humans. The MC was able to defeat him and after that the humans branded him as a traitor forcibly sending him back through the circle killing him in the process. So the hero get reincarnated to Japan where he grows up with a important person in the new team of heroes. When in high school he’s being treated the same way Hagimae was treated from commenplace. The whole class get summoned because they were at war again so he reconnections with his old team then he acted useless (he had all his powers) so he can get kicked out the palace so he can go to his loved ones and friends and the other countries.