You're an adventurer and while walking through a forest a bleeding armor clad guy stumbles out from behind a tree but immediately drops dead on the ground. You notice a trail of blood and decide to follow it. eventually you find a clearing with a lot of dead people and out of nowhere a white haired oni with red eyes attacks you with a katana. she' so fast you're barely able to see nor react to her but luckily you manage to parry her strike

"impressive..." she says in a cold voice