Shou Yue - Juewang de Wo Yu Mei Mo

Yoru Momiji is utterly disillusioned with his life, past, and future, and has resolved to end it all. Just when he finds no joy in existence, a succubus named Lilith appears, seeking to harvest the essence that humans release only when happy. Unable to extract any from the joyless Yoru, her pride as a succubus is stung. She challenges him to a high-stakes contest, determined to wring the finest essence from him yet.