Sekai no Hate no, Mannaka de. In the Center of the World's End

Synopsis

I don't like to show my feelings. I don't like getting involved with others even more. Maho who has repeatedly transferred schools is not big on relationships, feeling that "the world stays the same whether I'm here or not." But when she meets a boy called Satonaka, her world of loneliness starts to change into one where she can connect with others. (Source: Shogakukan, translated)