A Shinmei Ryuu swordswoman, is one of the three mercenary children that were hired to help Chigusa. Unlike Setsuna who uses a single sword style, she uses a sword and dagger style. She also knows how to use ofuda, or onmyōdō charms, the same way that Setsuna can. Tsukuyomi seems like she has a crush of sorts for Setsuna, though this is mostly of a subtextual nature, and likes to cosplay in Gothic Lolita cloths. She and Toko share similar appearances (Blonde hair, glasses), which has led to some speculation that they are related. She returned home after Chigusa was defeated.

As Negi's team arrives in the Magical World, a disguised Tsukuyomi was part of a squad lead by Fate to take down the Mahora team and frame them for the destruction of the gate between there and the human world. Recently, she has reappeared in another area of the Magical World where she has found Setsuna defenseless alongside Asuna.

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