The original figure model of Shiro Yukiko is made by Ishinaga Sakurako.
Ishinaga Sakurako is the sculptor behind the PVC’s for Supercell feat. Hatsune Miku: World is Mine and Lineage II Elf, which are 2 of the best looking PVC’s available these days .
This model is designed by The Dark Knight, it is called Shiro Yukiko : Shokubutsu shoujo en .
Some translator also called it Melty Snow : Seven Deadly Sins.