Riku Onda (Japanese name: 恩田 陸), born in 1964, is the professional name of Nanae Kumagai. She has been writing fiction since 1991 and has won the Yoshikawa Eiji Prize for New Writers, the Japan Booksellers' Award, the Mystery Writers of Japan Award for Best Novel for The Aosawa Murders, the Yamamoto Shūgorō Prize, and the Naoki Prize. Her work has been adapted for film and television. The Aosawa Murders was her first crime novel and the first time she was translated into English. It was selected by The New York Times as a Notable Book of 2020.
Read mainly for the Shirai story here, "Murder at the Headless Mansion." It was decent, but not to the level of some of his other stuff. Insanely funny false solution though, reminiscent of a Kindaichi Case Files trick. I also liked the other stories, my favourites would probably be Ayasaki Shun's "Etoile of the Time Mansion" and Inoue Magi's "The Tragedy of the Prison Mansion," both of which have very unconventional mystery elements, and I liked the way that they were used here. Takata Takashi's "The Shrine of the Demon God" was closer to a lecture on onis in Japanese history, but what mystery aspect was there was pretty cool. Not really a mansion mystery though. Onda Riku's "A Cage Floating in a Sea of Wheat" has a very dreamlike quality to it, that I also enjoyed. The solution and ending are both memorable. Hayamine Kaoru's "The Burning of the Mansion of Memories" was pretty funny, but unlike the others, it didn't have that much sticking power with me. Still, on the whole, do recommend this one.