A legal mystery in which patent attorney Miki Taiho uses her expertise and forceful negotiation skills in patent disputes. To protect a popular virtual streamer, she confronts competing corporate interests around alleged patent infringement.

Armed with patent rules, a patent attorney enters a dispute surrounding a virtual streamer.

In Japan, a legal precedent holds that proving a room was locked has the same value as proving absence from a crime scene, so a locked room guarantees acquittal and locked-room murders have proliferated. At Setsuhakukan, a snowbound hotel left by a famous mystery writer, a locked-room murder occurs; after the only bridge collapses, repeated killings leave strange playing cards beside the bodies.

A traditional mystery that solves a series of locked-room murders at an isolated snowbound hotel in a society where a locked room means acquittal.

In a world where a special power can temporarily revive the dead, a mystery follows the mutilated body of a murdered girl, damaged beyond revival. The central question is why she was killed again.

Why was the girl killed again?

Karasuma, a failed novelist making a living as a biographer, is asked to write the life of corporate founder Nampei Miyama. Investigating the Miyama family, whose misfortunes include a wife's suicide, a younger daughter's disappearance, and an elder daughter's vegetative state, he discovers the violent behavior of the younger daughter, known as the Witch of Chonomori, and a basement bearing traces of confinement and torture.

A mystery about a biographer investigating a family haunted by misfortune, drawn toward a sinister basement and a new murder.

A contemporary suspense novel in which a coded note found during an online class leads to 300 million yen, threats, and then a kidnapping. Japanese-language teacher Yukako and her partner pursue the truth while pursued by money and danger.

Three hundred million yen arrived. An email from Bocchan demands its return.

Yukako, a non-regular Japanese-language teacher, notices an encoded note on the desk of a Chinese exchange student known as “Botchan” during an online class. Testing it with her freeter boyfriend Keiji, she accesses an online bank account and they steal 300,000 yen from its 300-million-yen balance. Days later, 300 million yen in cash arrives at Yukako's apartment, followed by Botchan's demand for its return and news that a friend's fiancée has been abducted.

A crime mystery in which 300,000 yen stolen from an exchange student turns into 300 million yen in cash and a kidnapping.