You and your childhood friend Yua were supposed to just pick up a book from the decrepit building, but when a sudden twist of fate sends the two of you stumbling into a hidden realm teeming with spirits and yokai, it'll be up to you to find a way out! In this eerie supernatural dimension, you meet Izuna, who claims to be a great yokai with a fondness for humans. Can you escape this otherworldly realm, with the help of Izuna and the Kosaka sisters' spiritual powers?