Meitantei Yumemizu Kiyoshirou Jiken Note

A detective, previously a professor of a college, has moved into the house next to Ai Iwasaki. He's a reader who likes to read so much that he forgot to eat for three days, forgetting his birthday, and even forgetting the cases he has solved. He saw that there are three sisters (Ai, Mai, and Mii) in Iwasaki's house!