Character profile
Uruka Sumeragi
皇うるかBiography
According to Wikipedia, Uruka Sumeragi is Nako's best friend before Kurumi's arrival and is in love with Nako.
Story spoilers
Uruka sees Kurumi as an obstacle and tries to remove her. When Saki is awakened, Uruka ends up kissing her, causing Saki to fall in love with Uruka as her new master, though Uruka wants nothing to do with her.
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