Butler Saionji's Great Reasoning 2 (2019)

Continuation from season 1. Saionji Hajime serves the wealthy Ijuuin family. He graduated at the top of the London school for butlers. As the perfect butler, housekeeping skills and management of the mansion go without saying. He mastered martial arts and also has knowledge of all sorts of genres including science and history. Saionji has established a firm relationship of trust with Yuriko, the widow of the head of the Ijuuin family. He abides by the wishes of the inquisitive Yuriko and independently investigate difficult case. No matter how capable he is as a butler, he should be an amateur at investigating cases. However, nothing is impossible for Saionji who brilliantly figures out the mystery with his knowledge and skills.