Harapeko Shoujo to Tantei to

Ritsuka Haruno (20 years old) is a chuunibyou detective who loves the mystery novel "Madness Detective." With Oto, a dog-like assistant with a big appetite and a keen sense of smell, will Ritsuka be able to expertly solve numerous cases? From finding a cat to finding the great phantom thief, leave it to them. A high-tension detective comedy featuring these young girls!

(Source: Houbunsha, translated)