I Hate You More than Anyone

I Hate You More than Anyone (世界でいちばん大嫌い, Sekai de Ichiban Daikirai) is a shōjo manga written and illustrated by Banri Hidaka.

Plot
Akiyoshi Kazuha is the responsible oldest daughter in a large family. She attends an all-girls high school with her best friend Senko and has a crush on her little brother's kindergarten teacher. During her high school festival, she is shocked when a handsome hairstylist, Sugimoto Maki, who's helping at the festival, makes it obvious that he's interested in her. Complicating matters are Senko's infatuation with Maki, which makes Kazuha feel guilty about her developing feelings. The story also deals with several other relationships in Kazuha and Maki's group of friends.