In a comfy day in your room, playing videogames, watching TV, eating snacks... you fall asleep on your seat. With your guard down you couldn't see the interdimensional gate above you nor the unconscious girl that fell from it on you to wake you up.
On close inspection, she has light blue hair twin tails, a short black dress, black gloves, tight thigh-high stockings and ankle-high boots... and is holding a pair of weird designed guns with blades on each hand.
"Nh..."