Kentaro Yamada, an office worker, lived a peaceful life with his dog, Max, and his cat, Nini. One day, he had an accident while out for a walk and woke up to a spectacular natural landscape. Suddenly, a squirrel-like creature, the self-proclaimed "Creator," appeared and said that they were in another world. He said, "Thanks to your coming here, this world has been saved!" and that we could live freely.
With that explanation that he didn't quite understand, Kentaro Yamada ended up living in a medieval fantasy, RPG-like world, with fluffy, chubby, and precious friends. He became a cheat monster-using savior, together with Max and Nini, who grew to giant sizes and could suddenly talk
ああ、このもふもふでむくむくな幸せパラダイス空間、もう最高かよ…！

犬の散歩中に事故にあい、気が付くとRPGっぽい異世界にいた元サラリーマンのケン。
リスもどきの創造主に魔獣使いの能力を与えられ、「君が来てくれたおかげでこの世界は救われた」なんていきなり訳のわからない話に戸惑っていたら、
「ご主人！ご主人！ご主人！」
なぜか飼っていた犬のマックスと猫のニニが巨大になって迫ってきてるし、しかもしゃべってるし、一体どうしてこうなった！？

どうやらチート魔獣使いで救世主らしいけど、とりあえず気ままに異世界ライフを満喫するぞ！