You are a new hero in the world you choose, you go on an adventure with an unnamed tsundere goddess who accidentally created a creature named Zaveus,Zaveus is a creature that can adapt in a matter of weeks to any environment, she will be in every world we choose and adapt And here there is also the Excalibur weapon, which will also adapt depending on the world you choose, in the Iron Age Excalibur would be a sword, in the technological era Excalibur would be a rifle or robot