Nuclear Bomb Slime at the Start tells the story of Yu Yin, who becomes a beast tamer during the awakening ceremony and obtains an ordinary slime as his bonded beast. Because neither his profession nor his beast is highly regarded, he loses his original guaranteed admission qualification. On the eve of the college entrance examination, Yu Yin unexpectedly binds himself to a God-Tier Trait System, gaining the ability to split his slime infinitely and unlocking special combat traits. After entering the secret realm for the examination, Yu Yin fights magical beasts with his slimes and accumulates attribute points, gradually unlocking new abilities. While other candidates form teams to challenge the secret realm, he chooses to take the examination alone, relying on his ever-growing slimes to increase his strength and pursue the goal of ranking first in the examination.