Two worlds, one life

Akasuki Ronin, living in a normal world and having the dream of being a hero, which is practically impossible. Holding his head up and not causing others to let him down, he continues to stay positive no matter what. But after the end of a school day and walking through a forest, Akasuki finds a chest which contained a mysterious gem. To a bigger surprise, he gets teleported to another world and a mysterious person suddenly tells him he has to save the universe? Stuck in this predicament, Akasuki tries to find a way to balance his life between the two worlds and keep it a secret. But for how long can he do that? And will his dream finally come true?

(Cover is mine! I tried to draw one, but I know it's not that good.)