reika's manga / #Isekai(619)

MC and his classmates are teleported into a different world to become heroes and save that world with the promise to bring them back to Earth after accomplishing this. MC, who is declared to be the weakest with creation magic, is betrayed by someone during a dungeon exploration and almost killed but ends up surviving and becomes super OP.

Spin off of Tateno Yuusha. The Spear Hero constantly relives the times where the four heroes were summoned in the palace everytime one or all of them are killed and he doesn't know why...But his main goal is to help the Shield Hero and to hatch Filo who's a companion of the Shield Hero in the actual manga.

Yeon-Woo has a twin brother who has been missing for years. Their sick mother ends up dying and leaves him alone. He suddenly receives a mail informing him that his bro had been alive all those years doing adventures in a game like world. At first for medicine but he loses track of that goal somewhere along the way until he loses all his battle companions in that world and is backstabbed and killed by them. Yeon-Woo devotes his life to avenge his brothers death and finds the world his brother was talking about. Now all that's left is to find the assholes.