I play on playstation. on pc i have not noticed it but probably because it has a higher resolution
Whenever i walk the animation is always at full speed and does not slow down when walking slower. to reproduce push lightly on the controller stick or walk into a wall so that you can still move but not at full speed. this occurs every time you walk but are not as dast as normal walking
I wanted to buy yui just now and she is no longer buyable with shards, only cells. This is also true for oni.
PC/PS4 open the shop and you can only buy it with 250 cells and not the usual shards