Tohka is the first Spirit saved by Shido. She transfers into his class at the end of the first volume. Shido named her after the day of their first meeting, April 10th (though one kanji is different, the tenth day of a month is pronounced as Tohka). Reine later added the Yatogami surname for her. She has long dark purple hair and purple eyes. She is ignorant of the ways of the world, but nevertheless has a normal sense of embarrassment. As Shido was the first person to ever show kindness and acceptance towards her, Tohka develops strong feelings for him, which she is initially shown to be unable to understand when she gets jealous after seeing Shido accidentally kiss Yoshino. However, upon learning that Yoshino is a Spirit like herself, she decides to support Shido in his cause to save other Spirits such as Kurumi. She not only participates in battles at times, but even provides comfort and emotional support for Shido whenever he finds himself faced with a dilemma. As of volume 12, Tohka comes to fully realize that she is in love with Shido.
Tohka gets captured once by DEM Industries at the end of volume 6. Then in volume 7 upon seeing Shido ambushed and about to be killed by Ellen, she is filled with such despair that she underwant a transformation called Inversion, becoming noticeably far more hostile, and attacking everyone in sight, including Shido. Fortunately, Shido manages to bring Tohka back to her senses by kissing her. Westcott calls her Inverse state the Demon King, adding that this transformed state is the actual form of Spirits like her in the bordering dimension that they come from before manifesting in this world.
Her Angel is Sandalphon, which takes the form of a broadsword, usually with a throne that doubles as the scabbard, although at times it seems as though she can do just as much damage with or without it, using her hands to project dark energy spheres or bolts in order to slice through inanimate objects with ease. Her Astral Dress, Adonai Melek, consists of a purple ballgown. At full power she shatters the throne (volume 1) and combines the pieces with the sword turning the blade into Halvanhelev (the Last Sword) lengthening the blade several meters long, dramatically increasing her powers and can be charged to unleash an ultimate blow. Fortunately, the one time she used Halvanhelev Shido was able to stop and seal her before the unstable energy was unleashed. When she falls into utter despair, her Angel changes to Nahemah, the Qliphoth counterpart of Sandalphon and her Astral Dress becomes darker in color and more revealing. Her AST and Ratatoskr codename is .
Tenka Yatogami (?????, Yatogami Tenka)
Voiced by: Marina Inoue (Japanese); Michelle Rojas (English)
The original personality of Tohka Yatogami, who was born from the crystal of Sephira Malchut. Also known as Inversion or Dark Current. Shadow awakens and captures Tohka's body if Tohka is exposed to the strongest influence of negative emotions.