Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kirokunote is a light novel/manga series about a young woman who gets reincarnated into the villainess role in her favorite otome game written from the perspective of her fiancé, Prince Cecil.
- Arranged Marriage: Most of the characters are nobility so they're all quite limited in terms of who they're allowed to marry.
- Blood Oath: The process of contracting with a familiar has two parts: letting it consume some of your blood and giving it a name. Bertia managed to accidentally fulfill these conditions and form a contract with a fox-spirit when she gave it a nickname after it licked her wounds from tripping and falling during a walk home from the woods.
- Bookcase Passage: There's a small room hidden behind a bookshelf with a combination lock in the castle library.
- Dark Is Not Evil: When Bertia is informed that she has contracted with a dark spirit she initially remarks that it sounds quite befitting for a villainess, however once Cecil explains that dark spirits are more about defensive magic she says that that doesn't sound like a villainess at all.
- Evil Chancellor: Bertia's father, the prime minister, turned evil in the game as a result of losing his wife. Averted within the story proper as a result of Prince Cecil preventing the plague which caused said death.
- It Amused Me: Prince Cecil initially goes along with Bertia's stories about being isekai'd simply because it's one of the few things he's ever found interesting.
- I Want My Beloved to Be Happy: Sir Charles has a crush on his younger brother's fiancée, but held off on confessing his feelings because he felt that she would be better off with his brother. This trope also seems to be the reason Bertia is so adamant about pairing her fiancé Prince Cecil off with the heroine.
- The Matchmaker: Bertia tries to pair off all the prince's future advisors so that they can't end up in the harem ending with the heroine.
- The Password Is Always "Swordfish": The combination for the hidden room in the castle library is the queen's birthdate. Cecil is surprised at how obvious it is but decides not to tell his father since it would give away the fact that he was in there in the first place.
- Reverse Harem: One of the endings in Bertia's visual novel has the prince and all of his advisors falling for the heroine.
- School Festival: Halm Academy ends up having a cultural festival on Bertia's suggestion. There's even a fireworks display and a contest to vote on the school's best couple. Bertia and Cecil end up winning, naturally.
- The Silent Bob: After taking on a human form, Kuro communicates through gestures and facial expressions.