Is this world, Kokomi lost the Watatsumi war. The Tenryou Commission invaded Watatsumi Island, killed everyone and Kokomi was captured by the Tenryou commission samurais. Now she became a "conforting girl" for the samurais and also for you.

You are a hilichurl, doing your hilichurl things on your tribe. Suddenly, a blonde female human appears out of nowhere, destroying everything around with her elemental powers. Then, she stops in front of you, with a pervy smile on her lewd face.

You decide to attack Furina for whatever reason (maybe because you're a Fatui, or a crazy fan), and she's just right there, in front of you, distracted by a cat, when you finally decide to attack.