An Observation Log of My Fiancée Who Calls Herself a Villainess

An Observation Log of My Fiancée Who Calls Herself a Villainess

An Observation Log of My Fiancée Who Calls Herself a Villainess (Japanese: 自称悪役令嬢な婚約者の観察記録。, Hepburn: Jishō Akuyaku Reijō na Konyakusha no Kansatsu Kiroku) is a Japanese light novel series written by Shiki and illustrated by Wan Hachipisu. The series was originally posted as a web novel on the Shōsetsuka ni Narō website, before Shiki removed it in March 2017. AlphaPolis later published it as a light novel under their Regina Books imprint, releasing two volumes from May to September 2017. A manga adaptation illustrated by Natsume Hasumi was serialized on AlphaPolis' Regina manga website from May 2018 to August 2021 and was compiled in six volumes. A sequel series by Shiki and Hachipisu, titled An Observation Log of My Wife Who Calls Herself a Villainess (自称悪役令嬢な妻の観察記録。, Jishō Akuyaku Reijō na Tsuma no Kansatsu Kiroku), began publication under the same imprint in April 2022, with a manga adaptation by Hasumi starting on the same website in March 2022. An anime television series adaptation produced by Ashi Productions is set to premiere in April 2026.

Premise

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

An Observation Log of My Fiancée Who Calls Herself a Villainess

Cecil Glo Alphasta (セシル・グロー・アルファスタ, Seshiru Gurō Arufasuta): Voiced by: Yūsuke Kobayashi 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. Bertia Ibil Noches (バーティア・イビル・ノーチェス, Bātia Ibiru Nochesu) / Tia: Voiced by: Miyu Tomita 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. Heronia Inderon (ヒロー二ア・インデロン, Hirōnia Inderon): Voiced by: Yume Miyamoto Shawn Turquoin Alphasta (ショーン・ターコイン・アルファスタ, Shōn Tākoin Arufasuta): Voiced by: Ayumu Murase Joanna Curtswarren (ジョアンナ・ケルツウォーレン, Joanna Kerutsuwōren): Voiced by: Ayaka Ōhashi Nelt Krum (ネルト・クラム, Neruto Kuramu): Voiced by: Shun Horie Silica Lunea (シーリカ・ルネア, Shīrika Runea): Voiced by: Iori Saeki Charles Raonel (チャールズ・ラオネル, Chāruzu Raoneru): Voiced by: Yusuke Shirai Anne Kogares (アンネ・コガーレス, Anne Kogāresu): Voiced by: Aya Uchida Vald Norgins (バルド・ノーキンス, Barudo Nōkinsu): Voiced by: Hidenori Takahashi Cynthia Linnerith (シンシア・ソーネリス, Shinshia Sōnerisu): Voiced by: M.A.O Zeno (ゼノ): Voiced by: Atsushi Tamaru Courtgain Deres Mardan (クールガン・デレス・マーダン, Kūrugan de Resu Mādan): Voiced by: Seiichiro Yamashita Kuro (クロ): Voiced by: Akari Kitō

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 An Observation Log of My Wife Who Calls Herself a Villainess (自称悪役令嬢な妻の観察記録。, Jishō Akuyaku Reijō na Tsuma no Kansatsu Kiroku), began publication under the same imprint on April 5, 2022. Five volumes have been released as of June 5, 2025. The sequel is also licensed by digital-only by Hanashi Media under the title Observation Records of My Wife: The Misadventures of a Self-Proclaimed Villainess.

Observation Records of My Fiancée: The Misadventures of a Self-Proclaimed Villainess

No.	Original release date	Original ISBN	North American release date	North American ISBN
1	May 4, 2017	978-4-434-23231-2	July 30, 2024	978-1-961-78815-2
2	September 5, 2017	978-4-434-23697-6	February 28, 2025	978-1-961-78826-8

Observation Records of My Wife: The Misadventures of a Self-Proclaimed Villainess

No.	Original release date	Original ISBN	English release date	English ISBN
1	April 5, 2022	978-4-434-30111-7	May 30, 2025	978-1-961-78828-2
2	October 5, 2022	978-4-434-30897-0	January 29, 2026	978-1-961-78843-5
3	May 5, 2023	978-4-434-31941-9	—	—
4	May 5, 2024	978-4-434-33502-0	—	—
5	June 5, 2025	978-4-434-35815-9	—	—

Manga

A manga adaptation illustrated by Natsume Hasumi was serialized on AlphaPolis' Regina manga website from May 7, 2018, to August 6, 2021. The manga's chapters were compiled into six tankōbon volumes released from December 31, 2018, to October 5, 2021. The manga is published in English on AlphaPolis' Alpha Manga manga service.

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 tankōbon volumes as of June 5, 2025. The sequel manga is also published in English on AlphaPolis' Alpha Manga manga service.

An Observation Log of My Fiancée Who Calls Herself a Villainess

No.	Original release date	Original ISBN	North American release date	North American ISBN
1	December 31, 2018	978-4-434-25336-2	June 30, 2023	—
2	August 5, 2019	978-4-434-26101-5	June 30, 2023	—
3	February 5, 2020	978-4-434-26877-9	June 30, 2023	—
4	August 5, 2020	978-4-434-27636-1	December 22, 2023	—
5	March 5, 2021	978-4-434-26877-9	December 22, 2023	—
6	October 5, 2021	978-4-434-29415-0	December 22, 2023	—

An Observation Log of My Wife Who Calls Herself a Villainess

No.	Original release date	Original ISBN	North American release date	North American ISBN
1	November 5, 2022	978-4-434-31029-4	May 23, 2025	—
2	August 5, 2023	978-4-434-32329-4	May 23, 2025	—
3	June 5, 2025	978-4-434-35819-7	—	—

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 is set to premiere 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 will stream the series.

Reception

An Observation Log of My Fiancée Who Calls Herself a Villainess

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.