Boogiepop Phantom

Season 1, Episode 8: She's So Unusual

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This episode mainly revolves around Nagi Kirima, yet is told from the POV of Ichiro Kishida. He knew Nagi in the past, but he adopted a new alias and reentered her life as Ichiro Kishida. They go on a mission to stop the Manticore, a flesh eating shape shifter. They run into Boogiepop Phantom, who destroys the Manticore. However, the Manticore isn't gone forever...