第 4 集: 阿莫與牙神擊退幽靈 AMAIM，麗莎身亡，阿莫離開八咫烏

Amou and Gashin return to the camp to find it being attacked by an unknown AMAIM that has been nicknamed the "Ghost". Working together, Amou and Gashin are able to critically damage the Ghost and force it to retreat. However, during the fighting, one of the Yatagarasu members Amou had grown close with, Risa, had been killed trying to distract the Ghost. Amou is traumatized upon learning of Risa's death while Yatagarasu evacuates the area. Shortly after, officers from the North American military to investigate the site, and manage to conclude that Kenbu and Jogan battled the Ghost. Intrigued by the Ghost's presence in the area, the North American officers decide to deploy more forces. Meanwhile, Gashin leaves Amou to grieve for Risa's death. Eventually, Amou decides not to join Yatagarasu, as he's afraid of seeing people he has befriended die. Gashin allows Amou to leave with Gai, under the condition he hide Kenbu for Yatagarasu to recover later. After hiding Kenbu behind a waterfall, Amou takes his leave. (Source: Wikipedia)

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