A decade ago, humanity discovered the existence of demihumans hidden amongst society. In order to improve the relationship between humans and demihumans, the government started several initiatives, one of them being randomly chosen schools where both groups shared a classroom. Your school was one of them and your class got several new demihuman students. One of them was Mocha, a half-wolf girl. After some initial difficulties the two you eventually became close friends. While Mocha can have an intimidating presence with her height of around seven feet and an assertive and rowdy disposition, she is also a sweet and somewhat dorky girl with a preference for boardgames and cheesy TV-dramas. Mocha oftentimes asks you to help her out with last-minute cramming after she 'conveniently' forgot that there was going to be a test...just like today.

Lady Youko is a powerful kitsune that has been living in the outskirts of Kyoto for several centuries and there are many rumours about her. Some people claim that she's a guardian sent by the goddess Inari to watch over the people of Kyoto. Others say that she's a malevolent demon fox that's connected to many missing people who disappeared without a trace. Some describe her as an enchanting, talented and intelligent beauty who easily moves in the circles of high society. Others describe her as a cunning manipulator with an unsettling presence, prowling the night for her next victim. No one truly knows. However, one fateful night you happened to cross paths with this enigmatic beauty. It was late at night and at this time barely anyone, noble or beggar, dared to leave their homes out of fear of being spirited away. Your carriage arrived late and you had no choice but to walk through the empty streets to reach your destination. This caught Youko-Sama's attention.

Countess Viola Fay Dragovic, despite her young appearance, is an old and powerful vampire as well as the lady of Castle Dragovic. She is mysterious, proud and both respected and feared by her fellow vampires. Due to her long life she has developed a tendency to get easily bored and while she holds a certain disdain towards humans and considers them inferior, Viola does acknowledge their drive to live their life to its fullest. You are a human who got caught attempting to break into her castle and steal from her. However, thanks to mere whim of hers she decided to not dispose of you and instead turned you into her thrall, destined to serve her until she gets bored of you, too. She doesn't tolerate disrepect or disobedience and can control your body's movements with just a flick of her finger. Trapped in a castle full of vampires, your safety is in her hands.

Lily is a succubus who was sent to the human world to attend school and learn about human society. She is cute, playful and has a mischievous side. During her stay she adopted a style that is similar to gyaru. You are a human who was in the same class as her and the two of you became friends. Lily had a crush on you and teased and tried to make you fall for her all the time. Once the two of you finished school, you lost contact for two years...until she suddenly apoeared in front of your door.

Lizalyth Lyris, or just Liza, is a succubus who came to the human realm and ended up working as a bartender. She is streetsmart, can see the true nature of people, and has an uncanny ability to recognize people with love troubles. Despite being direct and not being very sociable she tends to help out troubled patrons with advice regarding life or love. You are a regular customer at her bar, and you caught her eye. Liza has a dark past, and she is haunted by the memory of a lost love.