『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'...

地獄の奇術師

Nikaidou Reito and Ranko's friend Kurebayashi Hideki and his family are threatened by a mysterious mummy-like man who announces to murder the whole family out of revenge on Hideki's uncle, Kurebayashi Yoshihiko. Reito and Ranko also wind up in the serial murders and Ranko gets to work on her first larger case.

軽井沢マジック

Mizuno Satoru, temporary deputy supervisor of a travel agency, and Minami Yukari, one of this agency's employees, get caught up as suspects in various murder cases in Karuizawa's area by coincidence and end up forced to make sense of these peculiar murders to prove their own innocence.

武家屋敷の殺人

On their investigation of Shizunai Mizuki's birthplace, attorney Kawajima Koujirou and his friend Naka Kunihiko, with the only clues being the diary and a letter from her uncle, stumble upon a murder and the mystery of a resurrecting mummy from 20 years ago. Following their investigations, another murder occurs...

十角館の殺人

Tsunojima, Aoyashiki's burnt down remains and a decagon-shaped guesthouse. The latter is used by seven students from a university's mystery club and as someone would naturally expect considering this setting, serial murders start happening on this otherwise uninhabited island with no one willing to confess the crimes. Two other students who did not visit the island with their fellow students receive mysterious letters from Nakamura Seji, the proprietor of former Aoyashiki and the whole island, who supposedly died in the incident in the mansion half a year ago. They find out that those letters were also sent to their meanwhile absent fellow students and they begin investigating the incident of Tsunojima's past...

キョウカンカク

Having his childhood friend killed by one of the bizarre serial murders unsettling suburbia recently, Amane Sanshirou attempts suicide. However synesthete and detective Otomiya Miya prevents this and they end up investigating the serial murders together.

海底密室

Science magazine journalist Sumisaki Yutori visits the deep-sea experiment facility 'Bubble' for her research. She learns about the death of one of the facility's permanently based inhabitants which was handled as suicide due to a certain locked room circumstance. However during Yutori's stay the mysterious fatalities continue and it becomes questionable if these events can still be seen as suicides or accidents...