Hikikomori Hime to Haraguro Ouji

Violetta, a sorceress girl who has been a recluse for many years, allowing only the spirits of darkness into her heart, is suddenly elected as a "priestess of light". Emidio, a prince of the divine kingdom of Alessandri, supports Violetta in her training as a priestess, even though she does not want to be a priestess of light. Huh? Emidio is smiling and talking, but for some reason, he sounds completely different....... The seemingly sparkling and dazzling Emidio is actually hiding an extraordinary black-heartedness...!