What about?
Saya no Uta is a love story that tells the life of a man who struggles to live in a world he hates. After a terrible accident that nearly cost him his life and killed his parents, Fuminori returns to a semblance of normalcy after undergoing life-saving surgery.
However, the surgery has altered his senses in such a way that everyday life becomes terrifying: sweet words sound like ferocious growls, his nose and palate endure everything as repugnant, and the people around him appear as amorphous monsters.
Afraid of being thought of as crazy if he tells anyone, Fuminori lives in this permanent hell—until he meets a beautiful young woman who not only appears normal to him but also takes pity on him and decides to help.
