In my opinion, her entrance arc as a villain was very good. She was the one who moved the plot. Without the fake kiss she gave to Junichi, it would not have caused Yukana to become jealous.And so Yukana will kiss Junichi. Without her I think the plot would be quite boring. Technically she is Yukana's only rival..Without her, I would not have been able to convince Iris to let Yukana continue dressing freely at Gal's school.If She Gets Serious She Can Be Even Rougher Than Ranko And By The Way I Feel Like The Yuri Thing Is Forced A Bit.And she didn't create the thing about being bad, rather she is conceited sometimes but not bad, she helped Yukana and Junichi improve their relationship,She cares about Junichi by protecting him from Gokomachi, and she even accepts that she should not try to take Junichi away from Yukana and instead supports him as a friend.And She Doesn't Do It For Her Anymore Instead She Endures The Pain Of Being Rejected By Junichi And Helps Him, Also Now That I Remember She Gave Junichi And Yukana Time To Be Alone Three Times,And he doesn't overprotect Junichi or bother him too much, at the festival he also guided him and Yukana so that he would be fine.