Yae Miko is Ei's oldest surviving friend and most popular fan-shipped partner (known as "EiMiko"). Their bond is built on centuries of history and deep trust.
The Traveler serves as the ultimate catalyst for Raiden Ei’s personal growth. Initially viewed as the "enemy of Eternity" for being an anomaly that could force change, their relationship evolves into one of mutual respect and companionship. Yae Miko is Ei's oldest surviving friend and
: Following her isolation, Ei displays a newfound openness, even remarking that trivial interactions with the Traveler fill her with motivation. Yae Miko : The Eternal Familiar Ei displays a newfound openness