Mika's best friend and classroom desk neighbour, Yui utilizes a Wind/Earth Reaper deck to dish out damage at half the danger. When she's not busy training with the eager and energetic succubus fox, she's gaming and streaming like a hardcore gamer, locking herself in front of a computer screen for entertainment.

And when she's not doing THAT, she enjoys brisk walks under the moonlight. She's not a wolf or a werewolf, yet she finds genuine comfort in the chilly night time.

That, and people who would mug people find themselves unable to mug her, be it from fear or because her ghostly tails get in the way.

Speaking of, 8 of these tails rarely show themselves. Most of the time people just see the one, but may catch a glimpse of the others at random moments. Usually when she's turning hostile.