The Elemental World of Time Travel

The male protagonist accidentally gets a game. This game allows people to have real abilities. The male protagonist is surprised and worried. This is a world where the strong survive. The weak must die. The male protagonist's main task is not to become a king but to figure out what's going on in this world. The second task is to protect his wayward sister. The female protagonist is the male protagonist's younger sister. After awakening, she is invincible. If you want to know what kind of story it is, just look forward to it. If you don't like it, don't comment. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.