Saya was the late younger sister of [Yuzuriha](https://anilist.co/character/137270/Yuzuriha).

Gabimaru the Hollow is one of the most vicious assassins ever to come out of the ninja village of Iwagakure. He’s ruthlessly efficient, but a betrayal results in him being handed a death sentence. He has only one hope—in order to earn his freedom, he must travel to a long-hidden island and recover an elixir that will make the shogun immortal. Failure is not an option. On this island, heaven and hell are just a hair’s breadth away.
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(Source: VIZ Media)

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