Manga by author Oda Aya

From Covenant of Darkness:For 10 years Saika has done everything she can to get close to her love Keishi. She followed him to the same high school, joined the same committees, and even changed her outward personality to become the right match for Keishi. One day, looking for Keishi in the special section of the school, she runs into the school's trouble-maker Kirisaki Shin. As he begins to bully her, her true personality comes out: loud-mouthed and violent. To her dismay, Kirisaki decides that he likes that kind of girl. Lovey Dovey is the story of Saika's trials and tribulations in a love triangle at a school where "Love is Prohibited."Read this manga from right to left

Everytime the dumb, naive, and pretty girl Makoto sees beauty she'll throw up~! Unfortunately once she enters the school, the first pair she encounters is the super weird, yet beautiful guy, Kiyoshi-sempai, and the incredibly beautiful guy, Atsushi-sempai!! Plus she was forced to join the "Beauty Research Club", she was put in chains by Kiyoshi-sempai and he just wouldn't leave her alone. But...the one Makoto actually likes is Atsushi-sempai...!!