23화: 쿠로와 아카네가 과거의 계약을 되돌아보는 동안, 케이는 마지막 메시지를 남기고 세상을 떠난다.

23

In a series of flashbacks, Kuro looks back at her journey from living with her family, meeting and forming a Contract with Keita, to returning to the Pure Place; Akane looks back from her time of residing with Keita to forming a Contract with Reishin and the destruction of the Masagami. Back in the present, after the ending of the Doppeliner System, Akane and Keita get married. Several decades later, Kuro receives a telepathic message from a very old and dying Keita. He tells her that he will take the curse with him, thanking her for giving him a happy life. Keita dies as the still young Kuro gratefully thanks her Contractee for everything he has done. (Source: Wikipedia)