I Actually Became One Punch Man

In order to investigate the truth behind the disappearance of his grandfather, Du Can and fourteen other university classmates participated in a graduation trip to Australia. Du Can found the mobile phone carried by his grandfather in front of a cave. When they entered the cave, they encountered a cave collapse. The people who finally survived found that they had come to a world beyond their imagination. What appeared in front of them turned out to be a group of giant mammoths! In this world, Du Can unexpectedly discovered that he was invincible! No matter what kind of powerful demons and monsters he is, he can defeat them with one punch! Well, this is a story about loving life, loving girls, and full of positive energy!