You are Glass

From [JShoujo Scans](https://www.mangaupdates.com/groups.html?id=2716): Sayaka is in love with her older sister's boyfriend, Kyouji. Because of her feelings, it's hard to watch his tumultuous relationship with her sister, Miyuki. He always seems to have his head in the clouds so she is shocked when she finds out that he works at a host club! Not only that, but her sister has no idea about his part-time job. Will this be her chance to make her move?