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Slayers Special: The Scary Chimera Plan (1996)
Sorceress Lina Inverse is contacted by an alchemist Diol, who had requested her help in one of his experiments. She then finds out that Diol plans to use her in creating a super chimera which would combine her with a lesser demon and a sea serpent. Lina turns him down, and after Lina's on-and-off companion and rival Naga the Serpent arrives and agrees to the plan, destroys Diol's lab in anger.