Kojou from hotel service checks into Sparrow's Hotel under cover as a guest to secretly check on the staff's competency. But it seems Satou has sensed... murderous intent?
an undercover inspector for 
the Sparrow's Hotel Group.
investigadora secreta 
del grupo Hotel Sparrow.
investigadora secreta 
del grupo de hoteles Sparrow.
uma cliente oculta do 
Grupo do Hotel Sparrow's.