Invaders of the Rokujouma!?

Season 1, Episode 8: Enter, the Evil Magical Girl!?

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No one believes Yurika that she's a magical girl. All of a sudden, an evil magical girl, Dark Navy Maki, shows up and transfers into their class. She tries to tell everyone that Cornoa Apt 106 is in danger, but no one listens. Maki is invited to the room for a welcoming party. Yurika decides to fight all by herself to protect everyone after talking to Harumi...