Otome Kaijuu Caramelise

A high school student with a rare, incurable condition that causes alarming physical transformations, Kuroe Akaishi keeps to herself, avoiding interactions with her peers. Her quiet isolation is disrupted by Arata Minami, a popular classmate whose presence increasingly affects her. As Kuroe navigates her growing feelings, she learns that her illness is linked to an unusual phenomenon: romantic emotions trigger a dramatic change, transforming her into a monstrous form.