MTL - Unlimited Anime Works

After picking up a phone on the streets, Feng Yuchen was sent to the world of High School of the Dead. He, along with 100 people, have to travel through various worlds, fight and solve quests in order to survive. Whoever dies in that world, would be teleported back to the real world without memories of what happened before and die in an accident one year later. - Description from Novelupdates