Kokuryuu Heika no Seiryaku Hanayome Majo desu ga, Tasuketa Ryuu ni Yomeiri Saserare Sou desu

"I'm not letting you go anywhere." Olivia is a witch who uses magic through singing. She lost her voice when she helped a wounded black dragon as a child, and has been living with her older witch sister, unable to use magic. One day, the sisters travel to the Dragon Kingdom to thank the Dragon King Liberto for saving his life. There, the Dragon King has no intention of getting married, and his aides, who want a powerful witch to be his bride, are secretly fighting... But Liberto, who has no interest in women, somehow starts visiting Olivia! A heartbreaking love fantasy woven by a witch who lost her voice and the most powerful Black Dragon.♡ (Source: Ichijinsha, translated)