Shitsuji Saionji no Meisuiri

Saionji Hajime is the perfect butler, and he works for a madame who is elegant. The madame is full of curiosity and has a pure personality. Hajime began to work for the madame before her husband died and they share a deep level of trust.
One day, they face murder case. The madame holds doubts about the murder case. Hajime uses his great reasoning powers in an attempt to solve the mystery.
(Source: AsianWiki)