Furenai de, Seibo-sama

Himari, known as the 'Holy Mother' of the school, is heartbroken when her childhood friend Daiya, whom she has had a crush on for years, gets a girlfriend. In the midst of her heartbreak, a junior boy, Itsuki, confesses to her, "I've always loved you"...? She still loves him, but she can't resist Itsuki, who ignores her rule of 'not touching the Holy Mother'...?