Anime Unlimited Harem

Dugu is a college student. Because he accidentally opened the space converter, a relic of the God of Space, and exchanged it with a pet-type monster, he came to a magical world. He discovered that there was a 70-year-old version of himself in his spirit in order to change himself. And after getting the secret system three thousand years later, I will kill you with a pistol magic bullet in a one-on-one challenge, I will snipe you with a sniper rifle in an assassination attempt, I will sweep you with Gatling in a group challenge, if it doesn't work, I will bombard you with a rocket launcher, and if it doesn't work, I will drive a tank to crush you to death.