After the "Co-eating" incident, Edogawa Ranpo came to the world of Harry Potter without warning. After learning that he would stay here for a few more years, Ranpo enrolled in Hogwarts with the daughter of Mrs. Abbot who adopted him, and learned Animagus in the hope of giving the president a big surprise when he returned.
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Mine clearing: I am a noob at writing, the plot is uncertain, the OOC is uncertain, and the CP is uncertain, so don't enter if you don't like it.
Concept: Compatibility of wizards and detectives