神のロジック 人間のマジック

Eleven-year-old Mamoru finds himself being handed over by his parents to a strange facility that certainly is not on Japanese ground. Even knowing he will return to his parents when starting middle school, he needed some time to adjust to the new environment but eventually got used to it and found new friends among the other five students in the rather unusual residental school in the midst of nowhere.

Half a year after he arrived at the facility, the students finally start to discuss various theories about why they are gathered in this building from all over the world to routinely work on the deduction workshop's assignments.

When a seventh student is announced, things start to distort like they did when another student arrived before Mamoru came and eventually disappeared without any trace. Is there really a black evil something in this facility that despises change? Everything gets out of control when the first murder happens...

Another

As the anime is airing this season and I'm too busy and/or lazy, get your summary somewhere else, but not on Wiki as that one already tells you a third of the whole novel.

緋色の囁き

Being related to the principle's family tree and therefore taken from her adoptive parents, Izumi Saeko becomes a transfer student of the reputable Seishin Girls' Academy and starts living in its dorm. Her roommate Takatori Kei seems like a kind person to get along with, but Kei herself thinks it would be better for Saeko to not get involved with her, leaving her with the mysterious statement "I'm a witch" before she is found burned to death in a forbidden room of the dorm where another girl died the exact same way 35 years ago. From that night on fear and suspicion prevail among the students and what was regarded by the teachers as possible suicide finds its continuance in clear murders afterwards. The scarlet whisper crawling up from Saeko's forgotten inner self and her continuous sleepwalking and strange dreams make her doubt herself. Might she actually be the culprit...?

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...