Magi: The Labyrinth of Magic

The Name of the Culprit is Sinbad (1x19)

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As Yamuraiha teaches Aladdin about the properties of Magic, Sinbad presents Alibaba with a sword he recieved from his late father to replace his broken knife as Amon's metal vessel. Morgiana is also asked to choose an item to be infused with Amon's power to serve as her household vessel, but she decides to have one forged from the same shackles she used during her times of slavery instead. Soon after, a fleet from the Kou Empire arrives bringing the fourth prince Hakuryuu Ren, accompained by Kogyoku, who accuses Sinbad of defiling her body in her sleep during his visit to the Emperor. By Sinbad's request, Yamuraiha makes use of her magic to prove Sinbad's innocence and it is revealed that it was all a scheme of Koubun Ka's to have him marry the princess by force. When Sinbad and Hakuryuu meet in private, the prince expresses his desire to destroy the Kou Empire, which is now under the influence of Al-Thamen.