The eldest sister of "The Three Little Girls", Yushi is also the most gentle, mature, calm and reserved of the three as well as being an Evolution of Xynthica. Whereas Puchi is a canine girl and Puri is a cat girl, Yushi is bird girl, however, she has a rather odd fixation. Yushi's dream is to swim in the open ocean, which makes a lot of sense when you take into account her huge feathery wings... oh wait, it doesn't.

Yushi is an extremely capable flier and wields a double sided halberd, often thought of as "The Oar of Doom", but it is her dream to swim like a fish in the sea, as such, she is perpetually and casually decked out in scuba gear. Unfortunately, those huge wings of hers drown any hopes of swimming, and so she has a tendency to sink like the Titanic in the spring time, any time she goes below a foot of water due to the resistance the wings create when wet.

In terms of her contribution to "The Three Little Girls", she plays the good cop, so to speak, often bringing her victims hopes up before her sisters bash them right back down.

In theory, it seems that Puchi, Puri and Yushi can all combine into a single Evolution to form a much more powerful high level Source combination, but such a thing has yet to be seen.