The Night Beyond the Tricornered Window

Tired of writing riddles for children, Yamaoka Momosuke plans on gathering spooky and gruesome stories and publishing them in an anthology called Hyakumonogatari ("One Hundred Tales"). While researching these old myths and legends he comes across a mysterious trio who call themselves the Ongyou. They are detectives who are investigating the legends to reveal their truths...and bring those in the wrong to justice. Each time Momosuke meets the Ongyou he must face horrible truths and battle with his morals, but he's seeing things he shouldn't be seeing...

Sumireko Ogawa’s dream of becoming a novelist is reinvigorated with new rumors of mystical incidents. Now a clerk at a bookstore, she enlists her young coworker, Ren Adashino, to investigate urban legends, black magic, and ghost stories across the city. Sumireko has a knack for triggering magical events, and Ren has a dark secret of his own. Will they survive their investigation unscathed?

Haruka Ozawa's sophomore year is getting seriously scary. One of her friends is possessed, another has committed suicide and Haruka could be the next one to flunk the still-breathing test. Her only way out of this potentially lethal dead end? Yakumo Saito, an enigmatic student born with a mysterious red eye that allows him to see and communicate with the dead. But the deceased don't always desist and some killers are more than ready to kill again to keep dead men from telling any more tales. That doesn't stop Haruka's knack for digging up buried secrets, and there's even more evidence of bodies being exhumed by both Yakumo's police contact and an investigative journalist with a newly made corpse in her closet! Can this pair of anything but normal paranormal detectives solve the ultimate dead case files or will they end up in cold storage themselves?

Between August and October, 1952, a series of unusual crimes takes place in Musashino and Mitaka: the attempted murder of 14-year-old Kanako Yuzuki, Kanako's abduction from the strange research "hospital" where she was recovering, then abductions of other girls, followed by their severed limbs in custom-fitted boxes being placed in surrounding towns. News editor Morihiko Toriguchi and crime fiction writer Tatsumi Sekiguchi investigate with the help of onmyōji Akihiko Chūzenji. Meanwhile, Tōkyō police detective Shutaro Kiba searches for Kanako, despite Kanagawa police having jurisdiction; and the lawyer for the estate of Kanako's grandfather hires private investigator Reijiro Enokizu to find Kanako, as well. Their investigation uncovers bizarre truths and dark family secrets along the way.