From the introduction:
Isekai, the sub-genre of portal fantasy where a (usually Japanese) person from our world gets transported into another world (typically a medieval fantasy JRPG setting).
This is a generic jump for visiting a fantasy setting using the tropes of the isekai genre. You decide how this world works, and the inclusion of a perk in this document doesn’t necessarily make it “canon” to your setting. Out of convenience, this document uses the word “magic” to refer to the supernatural abilities wielded in this setting, but you’re welcome to have a technically-not-magic power system instead. There is no modern “original” world in this jump. This is an isekai for you, the jumper, and from my understanding your old home is out of reach.