Monsters invade, the human race declines, and the protagonist Fang Fan obtains a breeding system!

Ding Dong, raise an ant and combine it with a hundred times the power.

Ding Dong, raise a spider and integrate spider sense.

......

Ding Dong, raise a water bear and fuse it into an immortal body.

Finally one day, Fang Fan found himself invincible, and the cute insects he raised stood on the mountain of corpses of countless monsters.