Эгоцентричный герцог и его заботливая служанка

Tekitou na Maid no Oneesan to Erasou de Ichizu na Bocchan

テキトーなメイドのお姉さんと偉そうで一途な坊っちゃん

The Earnest Egocentric Duke and his Satisfactory Sisterly Maid

An Adequate Older Girl Maid and Overly Eccentric Young Master