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Vowing never to separate from his childhood friend Hisame, Itsuki travels on the Tokaido with him in search of new adventures. Exterminating youkai along the way, they depend on each other to finish the job.
Halfway through the Tokaido, Hisame’s adventure continues with his childhood friend Itsuki. The plot thickens as Hisame discovers things about his father, and the mysterious demon blade Sengo Muramasa that used to belong to him. Yakumo, a newly introduced antagonist, desperately tries to get his hands on this sword, and will use all means to achieve his goal. The only link to Hisame's past and clues to as why Yakumo wants the demon blade lies with Hisame's sensei, Hibiki
Owari no Seraph