A psychological thriller centered on a series of monster-like crimes and a psychological battle over the identity of the culprit.

How human is the lumberjack monster?

A seventy-one-year-old woman is murdered in Nagoya, with a shogi pawn beside her body and a silver general in her pocket. As older people are killed in succession and shogi pieces are left at every scene, detectives Mizushina and Sada pursue the unexpected connection among the victims and the pattern indicated by the pieces.

A police mystery in which detectives read a killer's design through a series of murders of older people and shogi pieces left at the scenes.

A suspense novel about an unnamed man's revenge and the logic of the criminal underworld.

Revenge begins after a name is abandoned.

Sunta Uesugi, formerly the number-one host known as Seiya Sumeragi, becomes a first-grade elementary-school teacher. When a series of incidents involving injured plants and animals begins to affect the school, a pupil in his class named Gift emerges as a suspect.

A school mystery about a former host turned elementary-school teacher confronting local incidents alongside children with distinctive names.

A twisty classic mystery that pursues a case steeped in poison.

Like a snake without a tail, the truth cannot be grasped.

Returning to his hometown for a wake, Ryuichi Yahiro is asked by a girl named Kuon to tell her about her uncle. As an elementary-school student, a rumor that a body lay beneath a crape myrtle tree led Ryuichi to meet Ryohei Watarase, the fifteenth head of a detective agency founded in the Edo period. Together with transfer student Yukiko Kitagawa, they become involved in a series of cases.

A coming-of-age mystery in which memories of schooldays and the fifteenth head of a detective agency connect to a present-day question.

A journal written by second-year high-school student Shuji Doi records an inexplicable return from July 17 to July 8. Believing the loop is connected to the death of the school's most admired girl, Momoka Watanabe, who fell down a staircase, Doi investigates why she died while questioning the urban legend of a magician.

A school mystery in which a student investigates a girl's death as time appears to run backward.