After saving Mii-chan, a kitten who is a divine familiar, a young man named Nero is granted reincarnation into another world. However, the affectionate Mii-chan follows him to the new world!? To make things even stranger, the skill granted by the gods has been changed—now he can only summon cat supplies!? Thus begins a relaxing and fluffy isekai journey with the cutest and strongest Mii-chan!