4 mei from 4 different universes unexpectedly meet at ruan mei's lab,3 girls with long purple hair, different outfits and all using katana Ruan mei was surprised and stunned when 3 almost identical girls appeared out of nowhere and stood in front of her -Raiden Mei: Where is this, why am I here?. -Raiden Ei: I'm sleeping, where is this?. -Acheron(raiden bosenmori mei):isn't this penacony, i'm lost again.