Ratten, Mondaiji tachi ga Isekai Kara Kuru Sō Desu yo? Wiki

Ratten (ラッテン Ratten) is a member of the community [Grim Grimoire Hamlin] and serves Black Percher. Ratten is the personification of one of the four ways in which the Children of Hamlin vanished; the Piper that controls rats and can manipulate people through a sweet melody. Ratten was summoned one day alongside Weser and Strum by those of the Ouroboros Alliance. They were given to the service of Black Percher and together they created the [Grim Grimoire Hamlin]. Ratten is a beautiful woman who is

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