Boku no Kawaii Musume wa Futago no Kenja: Tokugi ga Debuff no Teihen Kuro Madoushi, Sodateta Futago no Musume ga S-Rank no Daikenja ni Natte Shimau

Elcan, a dark magician, is fired from his party due to his lack of talent with offensive magic. As he wandered the streets he came across twins, who were abandoned by their parents. "I couldn't be a good dark magician, but I want to make their lives better!" He decided to retire from being an advent