Every summer, the baby slimes embarked on a perilous journey from their villages to the monster training school, a rite of passage crucial for their evolution into higher beings. Even Cori, who had recently "reincarnated" as a baby slime, was not exempt from this challenging experience.

Cori was living a normal university life until he was hit by a truck and isekai into this fantasy world full of monsters. When he first arrived into this fantasy world, his spirit form witnessed the daunting challenge that awaited the baby slimes: navigating floating lily pads across the abyss to reach the school entrance, located across Wind Forest's cliff. The elder tree near the cliff added to the difficulty by occasionally slapping some unfortunate slimes off the lily pads, leading to uncertain fates.

The system introduced the training school as a crucial step for evolution, allowing some baby slimes the option to become beginner human adventurers, albeit frowned upon due to the need to kill fellow monsters to level up. However, killings can be circumvented if they decided on a non combat occupation. Fortunately or unfortunately, he was "reborn" in the wind forest which was quite near the training school.

The lack of instructions upon Cori's initial arrival, coupled with the deity's indifference, left him in a modest European-style countryside kitchen to ponder his situation. Luckily, the system resembled Earth's RPG (role playing game), offering a semblance of familiarity. Upon awakening, he found himself in the body of a baby slime. The deity who requested the hero, Cori (who was completely clueless about his supposed status) was too lazy to even offer greetings and explainations to his current plight. 

The first thing that crossed his mind was the frustrations that accompanied all the wasted studyings for his exams on Earth, followed by, "What the fxxk am I?" As if the situation was not obsfucating enough, Cori was baffled by his newfound abilities, including a 360-degree view and flubber-like paw-hand-fists. Devastated, he lamented, "seriously, god, seriously!?"- no thanks to truck-kun and the deity.