Yukiko is the other main character of this story.
She is on a road trip from Kansai to Okkaido, with her cat Cookie, her car Mira-chan and now her ghost-trip-companion Mei.
She looks tomboy-ish, and sometimes that makes her misgendered for a boy (she doesn't cares about what other people thinks).
She is kind of a "free spirit" and "acting on the spur of the moment" type.
She lives day by day.
She has the tendency to flirt with every girl she mets, making people think that she has a cool attitude, but when the girls returns the flirt, or they make it clear that they are interested in her, she doesn't know how to halndle it and runs away blushing.