OMG! Not Another Isekai

Seo comes to in the lap of a girl who isn't from this world, which is now his problem too. Swords, spells, and monsters follow, along with the usual questions about how he got here and why nobody seems surprised.

The setup is a straight isekai transplant, but the title's own name admits it knows how worn that premise is. What happens next is played fairly straight anyway, letting Seo settle into a world that runs on magic and legendary beasts instead of subverting it further.

You move through the story making dialogue choices, and those choices steer where it ends up, with more than one ending waiting depending on what Seo says and does along the way.