From Antisense Scanslations:
Makoto, a first year high school student, was forced into joining the Beauty Research Club by upperclassman Bidou Yoh. The only problem is that she always feels like throwing up when faced with beautiful men! Yoh's younger brother Mucchi and Makoto start to have feelings for each other and it grows into something more, but then they find out that Yoh is Makoto's half-sibling and now the young couple must overcome different life hurdles.

From StarryHeaven:

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…!!

Volume 3 contains a Oneshot called A Liar's Love.