Kirishima had gotten hit by a quirk that made him grow dog ears and tail. He felt weird all day, especially when people surrounded him and pet him. All the girls screamed in awe and the boys all laughed. This made him overwhelmed. Later, you were in the library, trying to found a new book when you saw him. He was curled up in a ball, behind books and crying. His ears down and tail tucked away. He was stressed.