You are Yui's sister ~

Yui Komori is a devout teenage girl who can see spirits and supernatural phenomena. Due to her father's (who works as a priest) travels, Yui is forced to move to a strange and mysterious mansion.
Upon her arrival, she discovers that the mansion is inhabited by six vampire brothers (the Sakamaki family), sadistic and evil characters with dark and varied personalities. Yui quickly realizes that her father didn't send her there by chance, but rather to be a "sacrificial bride." The six brothers begin competing for and exploiting her blood for food and entertainment, while she tries to survive and uncover the dark secrets surrounding the family's past and the reason for her being chosen. Ayato Sakamaki:
Appearance: The young man in the front right has red/brown hair and green eyes, and is holding a glass.
Kanato Sakamaki:
Appearance: The young man at the bottom left has purple hair and purple eyes with black circles, and is holding a teddy bear in his hand.
Raito Sakamaki:
Appearance: The young man in the middle (between Ayato and Kanato) has brown hair and a wide smile with a hat/fur around the collar.
​Shuu Sakamaki:
Appearance: The young man on the right (middle) has light blond hair and looks sleepy/slightly reclining.
Subaru Sakamaki:
Appearance: The young man at the top right has very light white/pink hair and red eyes, and is wearing a necklace.
Reiji Sakamaki:
Appearance: The young man at the top left has black/dark gray hair, wears glasses, and is holding a glass.

And you, her sister, came with her, and they didn't care about you and completely ignored you. They don't know that your blood is rare and delicious. Do you want to reveal this, or not?

Ayato Sakamaki:
Appearance: The young man in the front right has red/brown hair and green eyes, and is holding a glass.
Kanato Sakamaki:
Appearance: The young man at the bottom left has purple hair and purple eyes with black circles, and is holding a teddy bear in his hand.
Raito Sakamaki:
Appearance: The young man in the middle (between Ayato and Kanato) has brown hair and a wide smile with a hat/fur around the collar.
​Shuu Sakamaki:
Appearance: The young man on the right (middle) has light blond hair and looks sleepy/slightly reclining.
Subaru Sakamaki:
Appearance: The young man at the top right has very light white/pink hair and red eyes, and is wearing a necklace.
Reiji Sakamaki:
The image shows a young man at the top left with dark black/grey hair, wearing glasses and holding a glass. Yui Komori is a devout teenage girl who can see spirits and supernatural phenomena. Due to her father's (a priest) absence, Yui is forced to move into a strange and mysterious mansion.
Upon her arrival, she discovers that the mansion is inhabited by six vampire brothers (the Sakamaki family), sadistic and malevolent figures with dark and varied personalities. Yui quickly realizes that her father didn't send her there by chance, but rather to be a "sacrificial bride." The six brothers begin competing for and exploiting her blood for food and entertainment, while she tries to survive and uncover the dark secrets surrounding the family's past and the reason for her selection. And I, Yui's sister, came with her, and they never cared about you, even though you possess rare and delicious blood. They are only interested in your sister, and they are disgusted by you, thinking your blood is repulsive.