It is revealed that Ruriha and Tsubaki have Death Blood as well and that Tsubaki is Ruhiha and Hagane's mother. Hagane and Ruriha run away from Tsubaki. They face difficulties of interacting with other people, while Tsubaki looks for them.
Further investigation reveals that both Ruriha and Tsubaki possess Death Blood, and that Tsubaki is actually Ruhiha and Hagane's mother figure. Consequently, Hagane and Ruriha decide to escape from Tsubaki. They encounter challenges in forming relationships with others, whereas Tsubaki pursues them.