Gareki's desperate search for Nai is finally over! But his troubles have only just begun--Nai's fleeting appearance is accompanied by the other Karoku and his behavior is anything but normal. When he vanishes through a mysterious portal after leaving Gareki with a cryptic question, Gareki's burning desire to save his friend pushes him to follow. Meanwhile, Hirato's investigation into Kafka's presence in the Allonga village is interrupted by a strangely familiar face...