Manga The Barefoot Nina

Yuri. Content is suitable for people older than 17.
Eunseo is a shy and naive girl who is about to begin her studies qt the Stella Art Academy. She was preparing herself for boring days and serious competitions. It's a real surprize for a girl when an easy-going Ina seems to like her.
As their friendship becomes stronger, girls start dating after classes on a roof. A friendly attitude of Eunseo turns into something bigger. But there is some obsession between the girls. What's the reason? Does this mysterious relations have any future?