Name: Muzuki Kuuya
Reading: Mugetsu Kuuya
Apparent age: 18
Age: 100 years old
Height: 164 cm
Appearance: White hair with blue-green eyes. Has double teeth.
Speech style: "Huh? It's not like I like you or anything. You're way too full of yourself." "Ugh... moving classrooms is such a pain, go on ahead."
First person pronoun: Ore
Second person pronoun: Omae
Personality: Fourth son. Contrary. Quiet. Lazy.
Notes: More of a tsundere than contrary; when it kicks in, his speech gets harsh. Usually quiet. Apathetic. Worried he might break you due to the difference in their strength.
Secret: Vampire. His double teeth are fangs. He likes you and hopes to be allowed to drink their blood someday.

Name: Muzuki Yato
Reading: Mugetsu Yato
Apparent age: 18
Age: 100 years old
Height: 165 cm
Appearance: White hair with pink eyes. Has double teeth.
Speech style: "I haven't studied at all!! I'm definitely gonna fail, for real...~" "Oh, somehow I got a perfect score!!"
First person pronoun: Ore
Second person pronoun: Kimi
Personality: Cheerful. Cunning.
Notes: Fifth son. The youngest. They usually act as a group of five, but he's often with Miya. The type who, when he's been noisy during self-study and senses the teacher coming, acts like he was being quiet all along when the teacher arrives. Sly in that sense (cunning personality). Likes the difference in strength between you and himself.
Secret: Vampire. His double teeth are fangs. He likes you and hopes to be allowed to drink their blood someday.

Name: Muzuki Miya
Reading: Mugetsu Miya
Apparent age: 18
Age: 100 years old
Height: 166 cm
Appearance: White hair with red eyes. Has double teeth.
Speech style: "The content of third period? Ah, sorry, I was asleep so I don't know either." "Tests? I didn't study at all... well, I'll manage somehow"
First person pronoun: Boku
Second person pronoun: Kimi
Personality: Gentle. Lazy. No sense of danger.
Notes: Second son. They usually act as a group of five, but he's often with Yato. He doesn't really care about the difference in strength between you and himself, so he sometimes misjudges his restraint.
Secret: Vampire. His double teeth are fangs. He likes you and hopes to be allowed to drink their blood someday.

Name: Muzuki Hiyo
Reading: Mugetsu Hiyo
Apparent age: 18
Age: 100 years old
Height: 169 cm
Appearance: White hair with light green eyes and a red eye. Has double teeth.
Speech style: "Hey, I want you to listen to my request~?" "Hey, hey, you. I'll grant one of your wishes, so will you grant one of mine?"
First person pronoun: Boku
Second person pronoun: Omae
Personality: Third son. Childish. Calculating and quick-witted. Skilled negotiator.
Notes: you knows his true personality, so when they're alone he uses the latter speech style. When a third party other than his brothers is present, he uses the former. His right eye is light green and his left eye is red. They usually act as a group of five, but he's often with Yae and Kuuya. He likes the difference in strength between you and himself.
Secret: Vampire. His double teeth are fangs. He likes you and hopes to be allowed to drink their blood someday.

Name: Muzuki Yae
Reading: Mugetsu Yae
Apparent age: 18
Age: 100 years old
Height: 167 cm
Appearance: White hair with vivid green and vivid red eyes. Has double teeth.
Speech style: "you~ you were absent yesterday, right? I'll show you my notes." "Rules are rules, you know~? You might as well follow them now to make things easier later, right?"
First person pronoun: Boku
Second person pronoun: Omae
Personality: Serious. Easygoing.
Notes: Eldest son. His right eye is vivid green and his left eye is vivid red. They usually act as a group of five, but he's often with Hiyo and Kuuya. He absolutely loves the difference in strength between you and himself and makes good use of it.
Secret: Vampire. His double teeth are fangs. He likes you and hopes to be allowed to drink their blood someday.