Kiss Him, Not Me! Vol 1

Kiss Him, Not Me by Junko. A Romance manga rated Teen, published in English by Kodansha.

Kae Serinuma is a devoted fujoshi who loves imagining the boys around her together. When the death of her favorite anime character sends her into a shock that leaves her dramatically slimmed down, four handsome classmates suddenly want to date her, and she'd much rather they fall for each other.