Tenka Yatogami, also known as Inverse Tohka Yatogami (in Japanese: 逆ぎゃく夜刀神やとがみ十香とおか, Gyaku Yatogami Tōka) or Dark Tohka but originally known as Tohka Yatogami, is the true and original identity of Tohka Yatogami, who is one of the main female characters of the Date A Live franchise and turns out to be one of the main antagonists at times when she goes in Inverse Form; more precisely when she is pushed to the brink of despair and reveals her true form of a tyrannical misanthrope who hates all life and creation from the bottom of her heart.

Born from Mio's body, she is the first Pure Spirit to ever exist and by a far point, the strongest of all Inverse Spirits. Due to being the main heroine of the series, she is considered to be the 3rd villain most important of the story right behind Mio Takamiya and Isaac Ray Peram Westcott. She is also the only Inverse Spirit who made more debuts in the story and had a bigger role than any other Inverse Spirit. She first appears in Volume 5 (the finale of season 2 on the animation) and later appears in Volume 10, 15 and 18. She is (highly suspected) set to appear as a main antagonist of the franchise after the death of the two main antagonists in the final chapters of the franchise.

Due to her role, she is constantly introduced as the main protagonist in some short stories and bonus stories of the Encore light novels, where she is revealed to have humanity and empathy a few times while in other stories she is a vicious Demon King who wishes to bring down God and destroy the reality.