Tenshi 1/2 HouteishikiAngel 1/2 Equation; Tenshi 1/2 Hōteishiki; 天使1/2方程式

From Girls' Generation Scanlations: Yuiko is an average high-school girl who just has one wish: for her lips to stop being chapped and become smooth and soft! By a chance encounter, she enlists the help of Sugimoto Mana, the school prince who is one year her junior. Can Mana help Yuiko with her dry and chapped lips and will they also find love in the process? ~~~~~~~~ Feature the children of a couple from Hidaka's I Hate You More than Anyone (Sekai de Ichiban Daikirai) manga.