迷路館の殺人

Prominent mystery writer Miyagaki Youtarou invites his 4 disciples, a literary critic, an editor and his wife and mystery maniac Shimada Kiyoshi to his underground labyrinth mansion. However he is found dead when they arrive and a tape tells his disciples of his wish to improve their skills under the condition of being locked into this closed circle situation and write themselves into their works using his mansion as location. Their works are to be evaluated by the critic and the editor and the winner is going to inherit Miyagaki's entire fortune. The authors begin to write their individual stories and it does not take long until murders happen according to those scripts.

This incident became fairly known afterwards and one year later a literary reconstruction published by Kitansha Novels arrives at Shimada's. It was written under the pen name Shishiya Kadomi, who claims to have been involved in the case, which Shimada acknowledges before he delves into the book...

笑わない数学者

Saikawa and Moe are invited to legendary mathematician Tennouji Shouzou's Christmas party in his mansion Mitsuboshikan. While the guests are in the mansion's planetarium, the huge Orion statue in front of the mansion vanishes and the professor challenges his guests to solve this mystery. When the statue appears again later, the corpse of a guest who was supposed to have been in her room is found in front of it, while another corpse turns up in her room...

翼ある闇 メルカトル鮎最後の事件

When the detective Kisarazu Yuuya and his companion and mystery writer Kouzuki Sanetomo arrive at the medieval-ish mansion Souajou, Kisarazu's client has already been killed, just as this client's son, with their heads being cut off and swapped with one body and head found in a locked room. For what sake do the serial murders in the Imakagami family continue? Why all the incomprehensible staging of the murders? And why was Kisarazu hired in the first place?

『アリス・ミラー城』殺人事件

Various detectives are gathered on Erikajima to investigate Alice Mirror Castle and find the Alice Mirror. A chess board with 10 white figures makes the detectives aware of their situation being strikingly similar to a certain literary masterpiece and the further development unfortunately supports their hunches...

吸血の家

The exorcism of a spirit whose grudge founded a whole family curse calls forth seemingly impossible crimes and forces Nikaidou Ranko to uncover the secrets of the Masamiya family and the fate that is about to befall the three sisters.

水車館の殺人

The odd-looking 'water wheel mansion' inhabited by a masked host and a lonely young woman... Last year in a stormy night it was haunted by an unfathomable tragedy. Will the nightmare occur this year again? The secret of Fujinuma Issei's posthumous visionary painting and the mysterious disappearance of Shimada Kiyoshi's friend from a locked room guides Shimada to the mansion to uncover the secret truth hidden behind the steadily turning water wheels...

『クロック城』殺人事件

In 1994 a sunspot 30 times as huge as the earth was discovered and by its influence the planet has been in disorder since then. The world is said to meet its demise in 1999. It is in that year, that a certain request for detective Minami Miki drops in. He proceeds to Clock Castle, whose outer wall is furnished with 3 huge clocks which display past, present and future, and whose interior is divided into 3 separate mansions as well. The proprietor's daughter, Kurou Ruka, is said to be Midnight's Key, a crucial being in earth's final moment. She asks Miki to investigate the eerie face staring out of the cellar's wall. Ruka suspects a ghost called Skipman, which rumor has been passed on in the mansion for generations. This Skipman is supposed to be able to rip a hole into time and travel into the past and future. Soon after Miki begins his investigations, a seemingly impossible murder resembling the legend of Skipman ensues...

冷たい密室と博士たち

Assistant professor Kita Hokuto invites his friend Saikawa Souhei and consequently Nishinosono Moe to the cyrogenic research facility he is working at. In the cyrogenic laboratory a murder happens. Despite all surveillance during the experiment, two students are found dead in a complete locked room situation. How did the culprit enter the room and how did he escape when even the two victims could not have entered the room in the first place?

少女ノイズ

Takasuka Katsushi, a young man lacking certain memories and Itsukinomiya Mei, a girl that closed her heart, meet on a cram school's rooftop. He feels gravitated towards crime scenes and takes photos of those while she seems like a living corpse wearing huge disconnected headphones. They soon wind up in solving various mysteries happening among the students at the cram school.

すべてがＦになる

After being accused of murdering her parents at the age of 14 and considered as certifiably insane due to her multiple personality disorder, computer scientist and overall genius Magata Shiki retired from the world and lives in her own little locked room in the Magata research facility on an isolated island. 2 doors separate her from the rest of the facility. The inner one can only be opened with her admission while the outer door can only be opened by the other facility members and she has not left her space for 15 years. When engineering assistant professor Saikawa Souhei and his student and his former professor's daughter Nishinosono Moe request a meeting with professor Magata in this threefold locked room, a corpse wearing a wedding dress advances out of the room and what is left in there is a computer displaying the incomprehensible message 'all becomes F'...