One of the characters in the fourth (technically fifth) Bishoujo Mangekyou, Tsumi to Batsu no Shoujo (Girl of Sin & Punishment).
Yuuri is the twin sister of Kannagi Yuuma. She is a spoiled and popular student at her school, to which most students call her an idol. She has always been at the top and cares a lot about results. She enjoys teasing Yuuma just for the fun of it.