In/Spectre (虚構推理, Kyokō Suiri, also known as Invented Inference) is a 2011 Japanese novel published by Kodansha and written by Kyo Shirodaira with illustrations by Hiro Kyohara and since volume 2, by Chasiba Katase. A manga adaptation with art by Chasiba Katase has been serialized since April 2015 in Kodansha's shōnen manga magazine Shōnen Magazine R and since October 2019, also on Monthly Shōnen Magazine. It has been collected in eleven tankōbon volumes. The manga is published in North America by Kodansha Comics. A 12-episode anime television series adaptation by Brain's Base premiered on January 11, 2020 and ran until March 29, 2020.
While struggling to get past a break-up with his girlfriend, Kuro Sakuragawa was approached by Kotoko Iwanaga, a girl who declared that she was in love with Kuro since a few years ago. She then dumps on him that she is a sort of Goddess of Wisdom where she serves as the intermediary between the real world and the supernatural world. Kuro, of course, doubts her at first but after fighting a yōkai in a library and revealing to each other their true identities (Kuro is actually a monster that has eaten two different yōkai meats giving him the powers of immortality and near-absolute precognition), Kuro agrees to help Kotoko on her various adventures as the peace-keeping Goddess of Wisdom.
- Official anime website (in Japanese)