The End of the World: Everyone Awakens Their Superpowers, and I Cultivate Immortality Alone

Dogs don't even have to use supernormal abilities, cultivating immortality is the way to go! I have a system for cultivating immortals, and the doomsday era will be the era when I become an immortal! This is my first novel for a newbie. I hope everyone will support me and I will work hard!