Koushirou Kujou the Detective Butler summary: My lady. I have prepared delicious black tea with cakes and outstanding mysteries. What’s Hakoniwa Detective Agency? It is a detective agency that handles extraordinary cases. It accepts cases that are related to the supernatural, urban legends, or rumors that people do not consult with common detective agencies. It also provides delicious black tea and desserts to our clients. Koushirou Kujou He is the butler of Hakoniwa Detective Agency, but is also a famous detective. He is not only erudite, but also insightful with eloquence. He is overprotective of Yui, but is very invective to Akira. Yui Mikami She appears to be a pet.i.te girl; however, she is able to see and be possessed by spirits. She is the master of Hakoniwa Detective Agency. She is fond of desserts. Akira Satou He is searching for “the phantom of that day” which stays by him at the time he was once distressed. He is a high schooler finally arriving at Hakoniwa Detective Agency. He has a positive way of thinking and is resilient.