An Observation Log of My Fiancée Who Calls Herself a Villainess

Cecil, who is numb to emotions, becomes interested in his fiancée, Tia, whom claims to be a reincarnator who was reborn as the villainess of an otome game. Thinking she is simply crazy at first, Cecil plays along; until events that Tia foretold begin happening as she said. Because of what appears to be psychic power, Cecil decides to take more interest in her and listen to Tia's ramblings. ==Characters==

; : :First prince, who suffers from a hereditary mental disorder that leaves him somewhat a psychopath; it's not consistent with each generation, but randomly manifests via atavism. His father told him the only way to feel love is to find the right person, whom can interest him and bring joy; ironically enough, it turns out to be Tia, instead of the heroine, due her bizarre behavior. He was the popular love interest of the otome game, which is why Tia keeps trying to make herself look less appealing to him and get their engagement annulled; though Cecil finds her new ideas interesting and chooses to stick with her. ; / Tia : :A girl reborn as the villainess of her favorite otome game. A clumsy girl who claims to be a villainess, which interests Cecil. Tia tried to get her father to be the villain he was by giving him a manual on upcoming events; however, he instead took the good path and reported intel to Cecil. Despite her obliviousness, Tia does have a natural talent for organizing information in books; which comes in handy for Cecil, who corrects future issues behind her back with said information. :Unknown to Tia, she has contracted a spirit of darkness, who she named "Kuro"; due to the fact magic wasn't in the original game. Doubling her ignorance is that her spirit only appears in the form of a child due to Tia never staying awake long at night; dark spirits are weak during the day, thus Tia spending most of her time being active during the day indirectly prevents her spirit from gathering power in the night. ; : ; : ; : ; : ; : ; : ; : ; : ; : ; : ; : ; : ==Media==

Light novel Written by Shiki, An Observation Log of My Fiancée Who Calls Herself a Villainess was originally published on the Shōsetsuka ni Narō website until Shiki removed it on March 27, 2017. AlphaPolis later published two volumes with illustrations by Wan Hachipisu under their Regina Books light novel imprint from May 4 to September 5, 2017. The series is licensed digital-only in English by Hanashi Media under the title Observation Records of My Fiancée: The Misadventures of a Self-Proclaimed Villainess. A sequel series, titled , began publication under the same imprint on April 5, 2022. Five volumes have been released as of June 5, 2025. The manga's chapters were compiled into six volumes released from December 31, 2018, to October 5, 2021. A manga adaptation of the sequel series, also illustrated by Hasumi, began serialization on the same website on March 29, 2022. The sequel manga's chapters have been compiled into three volumes as of June 5, 2025. An Observation Log of My Fiancée Who Calls Herself a Villainess An Observation Log of My Wife Who Calls Herself a Villainess Anime An anime television series adaptation was announced on May 12, 2025. The series will be produced by Ashi Productions and directed by Junichi Yamamoto, with Akiko Inoue handling series composition and episode screenplays, Miki Matsumoto designing the characters, and Yuki Hayashi, Luke Standridge and Asa Taylor composing the music. It premiered on April 6, 2026, on Tokyo MX and other networks. The opening theme song is "La Fleur", performed by Airi Miyakawa, and the ending theme song is "Magic", performed by RLOEVO. Crunchyroll is streaming the series. Episodes ==Reception==

In 2021, the manga adaptation, alongside ''The Savior's Book Café Story in Another World'', won the Isekai Comic Prize at NTT Solmare's Digital Comic Awards 2021. ==See also==