The Twilight Hotel, where day and night do not exist and the world is perpetually bathed in a dusky glow. It is a hotel that exists in the twilight between life and death, a place where souls who are undecided about whether to move on to the afterlife or return to the living world can rest their wings.
The protagonist, Onko Tsukahara, wanders through the hotel without any memory of who she is or why she is there.
With the guidance of the hotel staff, she is led to a guest room.
"In your room, there should be an item related to your memory. Perhaps, using it as a clue, you can regain your lost memories."
As she explores in order to return to the living world, Onko begins to recall fragments of her past. But soon, she faces a certain incident...