This is the OST from parody musical game "Isekaing: from zero to zero". It is split in two parts:

First - songs with lyrics, mostly consists of character's origins story, some of them - comedic, others - serious.
Here you can hear songs of the pixie who is both bard and barbarian, immortal dragon, mimic, siren, narrator, court bard, and even digital pirate.

Second - BGM tracks from the game.

You can use this music in your own projects, or however you like.