Michiru Yajiri works as the neighborhood tarot card reader in the shopping district containing the antique shop. She routinely uses space inside Eiri Kurahashi's antique shop for her tarot sessions. These readings frequently offer symbolic foreshadowing tied to unfolding events around Eiri and the cursed artifacts, especially sensing death or negative energies clinging to him.

An emotional connection exists between her and Eiri, drawing her into the narrative of Cossette's vengeance, though the exact nature or depth of this bond remains unspecified. Michiru possesses nascent psychic abilities that let her perceive supernatural disturbances impacting Eiri, yet she lacks full comprehension of their sources or consequences.

Her appearance features medium-length black hair and gray eyes, characterized as unremarkable. She maintains a mysterious presence, with minimal personal background or clear development provided in the OVA or related media. While other female characters actively intervene in Eiri's crisis, Michiru's role stays observational, restricted to her tarot insights and faint awareness of paranormal forces.

The manga adaptation and other official extensions offer no further elaboration on her background, history, or substantial evolution. Her involvement concludes without resolution or expanded focus, cementing her established function as a secondary figure in the ensemble surrounding Eiri.