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 reincarnated and 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.

Cecil Glo Alphasta (セシル・グロー・アルファスタ, Seshiru Gurō Arufasuta)

Voiced by: Yūsuke Kobayashi^[2] (Japanese); Blake NcNamara, Donna Xia (child)^[3] (English)

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. The story is shown from his point of view.

Tia's reason for continuing the role of a villainess that the original Bertia held is because in the original otome game, Heronia was the heroine who could choose between Cecil or his aides which include Courtgain, Charles, Nert, or Bard (or in one special case, all five of them). In Cecil's route, he finds happiness being with Heronia. By contrast, any route that wasn't Cecil's ended with the country going to war or suffering the aftereffects of war and Cecil being assasinated (Courtgain's route), go missing (Charles route), run away (Shawn's route), be a recluse (Nert's route), or become a warmonger (Bard's route). She believes the country could be at peace and Cecil would find happiness only if he paired up with Heronia. However, as a result, she is stubborn and is at times innocently insensitive to Cecil's feelings towards her, especially as he is disgusted and wants nothing to do with the current Heronia, who is notably nothing like the kind hardworking girl of the original otome game (as the current Heronia is also a reincarnator from Bertia's original world).

Through Bertia's influence, while he fundamentally does not change as a person, he is kinder and much more considerate of those around him and takes his duties as crown prince seriously. He also manages to care about his family and remain close friends with all of his aides and does care about their happiness as well. He also deeply loves Bertia and while he worries about her impulsive actions, he resolves himself to let her do as she pleases while ensuring no one will harm her with the support of both their friends and family because her antics never cease to amuse him and bring color to his previously dull life.

Bertia Ibil Noches (バーティア・イビル・ノーチェス, Bātia Ibiru Nochesu) / Tia

Voiced by: Miyu Tomita^[2] (Japanese); Kelly Greenshield^[3] (English)

A girl reborn as the villainess of her favorite otome game. A clumsy, outgoing, impulsive, kind, and energetic girl who claims to be a villainess, which interests Cecil. Her nickname is Tia. Not much is known of her previous life, though she mentions she was obsessed with the original otome game and was especially fond of the character Cecil, which carries over into her current life as Bertia. However, even though she falls for Cecil as a person, she forces herself to be a villainess as she believes only Heronia, the original heroine of the game, can bring happiness to Cecil.

As part of her efforts to follow the original plot of the otome game and set up Cecil with Heronia, she helps Cecil's friends/aides (who were also capture target in the otome game Bertia played) with their relationships with their respective love interests. Tia also 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 best efforts to be a villainess, her kindness and clumsiness instead cause her to be seen as endearing, causing many to become fans of her. Her kind outgoing straightforward nature makes her so popular that she has a fan club that manages to garner fans outside the country.

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. This talent later allows her to write popular tour guides and, after her marriage, wedding magazines that are so popular that she gets asked to organize weddings for the royalty of other countries.

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^[4] (Japanese); Francine Gonzalez^[3] (English)

The "heroine" of the game. While the original Heronia of the otome game was a kind soul and hard worker, the current Heronia is selfish and a fellow reincarnator who feels entitled to Cecil's and the other capture target's affections. She enacts the routes from the original game and remains delusional, not recognizing that the world and the people are real and the world has changed from the otome game. As a result, she frequently antagonizes Bertia and bothers Cecil and the other "capture targets"/love interests of the original game. Her only true friend is Pii-chan, the light spirit who takes the form of a bird and helps Heronia by using its ability to brainwash others. She is forced to realize the error of her ways when Pii-chan dies in its attempt to help Heronia. After her actions are exposed and she is forced to become a nun and go to a monastery, she chooses a dangerous one in the north as there is hope that she can resurrect Pii-chan, her one and only friend, if she goes there.

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^[5]

Cecil's younger brother. Unlike Cecil, he did not inherit the mental disorder that is passed in the royal family and was spoiled as a child. As a result, he is somewhat childish and blunt but remains a kind gentle soul to the point his smile is compared to an angel's, while his brother's smile is compared to a fallen angel's. He loves sweets and is close to Cecil. He understands he is not fit to be king and wholeheartedly supports Cecil as the future king and looks up to him. Although he is engaged to Joanna, he was at first fearful of her because she seemed so perfect. However, once he saw she wasn't perfect after failing to make sweets, he grew to see her as a normal girl and developed a desire to protect her and be a good partner.

Joanna Curtswarren (ジョアンナ・ケルツウォーレン, Joanna Kerutsuwōren)

Voiced by: Ayaka Ōhashi^[5]

A close friend of Bertia ever since Bertia helped defend her from a suitor who refused to leave her alone. She is the president of Bertia's fan club and ensures her safety. She was once engaged to Cecil but was too similar to him and they both mutually gave up on the engagement as a result. She dislikes Cecil despite being similar as a "black-hearted schemer" but both deeply care for Bertia. She also deeply loves her fiancé Shawn and fawns over both him and Bertia.

Nelt Krum (ネルト・クラム, Neruto Kuramu)

Voiced by: Shun Horie^[5]

A friend of Cecil's and one of the capture targets in the original otome game. He is very intelligent but shy and is engaged to his childhood friend Silica. While he was at first annoyed by her strict behavior, he grows to appreciate her.

Silica Lunea (シーリカ・ルネア, Shīrika Runea)

Voiced by: Iori Saeki^[5]

A friend of Bertia's who has skills in cooking and a motherly personality. She is the fiancé of her childhood friend Nelt, whom she often looks after but cares for deeply.

Charles Raonel (チャールズ・ラオネル, Chāruzu Raoneru)

Voiced by: Yusuke Shirai^[6]

A friend of Cecil and one of the capture targets in the original otome game. He acts easygoing and tends to flirt with women, but in reality he is in love with Anne but restrains himself because she is engaged to his older brother and marrying him would grant Anne a higher status than marrying Charles, who is the second born. As a result, he flirts with other women in the hopes of moving on from Anne. With Bertia's interference, he confesses his love and enters a relationship with Anne. He devotes himself into becoming Cecil's personal aide so he can rise in rank and be worthy of Anne. He also gives up his womanizing ways as a result.

Anne Kogares (アンネ・コガーレス, Anne Kogāresu)

Voiced by: Aya Uchida^[6]

A friend of Bertia's who is the most ladylike. While she was in a political engagement with Charles' brother who is a well known playboy, she later chooses Charles after hearing his heartfelt confession of love (with Bertia's intervention) despite his initial lower status. She chooses to get into politics in order to help support Charles in his future as Cecil's personal aide.

Vald Norgins (バルド・ノーキンス, Barudo Nōkinsu)

Voiced by: Hidenori Takahashi^[6]

An athletic but not too intelligent friend of Cecil's. He is friendly and straightforward but lacks tact. He is engaged to Cynthia who shares similar athletic interests such as horseback riding and martial arts.

Cynthia Linnerith (シンシア・ソーネリス, Shinshia Sōnerisu)

Voiced by: M.A.O^[6]

A friend of Bertia's and the fiancé of Vald. She shares his love of horseback riding and martial arts and loves competing wih him. However she is far more socially aware than Vald and helps keep him in line.

Zeno (ゼノ)

Voiced by: Atsushi Tamaru^[6] (Japanese); Tom Aglio^[3] (English)

Cecil's contracted spirit who poses as his butler. He shares a telepathic link with Cecil and despite his loyalty to Cecil, Zeno tends to snark at him. His main elements are water and wind but because he has the blood of the spirit king, he can control all elements outside of his main ones at a decent level. At the end of the series, he marries Kuro and she is pregnant with his child.

Courtgain Deres Mardan (クールガン・デレス・マーダン, Kūrugan de Resu Mādan)

Voiced by: Seiichiro Yamashita^[6]

A friend of Cecil's and one of the capture targets in the original otome game. In the original otome game, he was adopted into Bertia's family since Bertia's mom died without leaving a male heir and Bertia's father forced Courtgain to help him commit horrible deeds. Because Bertia's mom is alive and gave birth to a son, Bertia tells Cecil about his existence to ensure the course of the world still follows the otome game. Cecil, intrigued by Courtgain's competence, convinces him to be adopted by a different noble family involved in dubious actions to act as a spy. He is cold to most except for Cecil (as a result of Cecil recognizing his abilities and helping him move in rank) and Bertia (who views him as a brother of sorts). Cecil sees him as a reliable ally who he can entrust both official work and shadier work. In the sequel, he becomes close to Bertia's maid Mirma.

Kuro (クロ)

Voiced by: Akari Kitō^[6] (Japanese); Gillian Lange (English)

Bertia's contracted spirit. As a spirit of darkness, she specializes in barriers and defense. She takes the appearance of a young child with fox ears and tails (although most people can't see the ears and tail) and is protective of Bertia. She does not speak but expresses herself through her actions. She is not fond of Cecil but puts up with him for Bertia's sake. Her favorite food is inarizushi. She marries Zeno and is pregnant with his child at the end of the series.

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.^[47]

• 7th Time Loop, another light novel series with the same illustrator
• Goodbye, Overtime! This Reincarnated Villainess Is Living for Her New Big Brother, another light novel series with the same illustrator
• I Was Reincarnated as the Villainess in an Otome Game, but the Boys Love Me Anyway!, another light novel series with the same illustrator