I separated this into two parts. The first part has the character described by role number. The second uses their names. Whichever one is more understandable to you is the one you should stick with reading :3
If anything doesn't make sense, let me know so that I can explain it better.
The Basics
Female #2 knows Male #2 due to her seeking out a tutor, and one of her friends is related to him (Female #1, who is Male #2's cousin), and recommended him as a teacher.
Male #1 and Female #1 are siblings.
Male #3 and Female #3 know each other through mutual friends.
Now let me make this part as simple as possible. I'll split this explanation into three sections - How the guys know each other, how the girls know each other, and then how the guys and girls know each other.
The guys
Male #1 knows Male #2 due to the fact that they are cousins and went to the same high school and were in the same grade. Male #1 picked on Male #2 for their entire high school career because he found him to be a nerd. Once they got into college, though, they buried the hatchets and get along just fine now (unless the roleplayers who play those characters want them to butt heads still, which is A-okay with me, since this is just an outline)
Male #1 knows Male #3 because Male #3 has been friends with Female #1 since they were young, after he left his home. They haven't been super close, but close enough that they hung out a couple of times together, normally with other people around. Due to Male #1's protective nature of his little sister, he's kept a close eye on Male #3, since he's heard rumors of how dangerous he is.
Male #2 and Male #3 do not know each other.
Now for the girls
Female #1 knows Female #2 because they were in the same class and grade all the way up until high school. When Female #1 hit high school, she skipped her Freshman year, and then ended up skipping her Junior year too due to her grade and intelligence when it came to academics. Female #1 and Female #2 remained good friends despite this, and Female #1 always tried to help her with her schoolwork - obviously to no avail. She introduced Female #2 to Male #2 in an effort to help her with her classes.
Female #1 knows Female #3 for similar reasons of her knowing Female #2 - they were in the grade and class up until high school. They weren't close friends, though. She also knows her because Female #3 is best friends with Female #1's cousin, Male #2. They're friends, but not best. They talk but it isn't a big habit for them to hang out together.
Female #2 knows Female #3 because they've been in the same grade and class from elementary through all of high school. They've also been kind of forced together because of their connections with Female #1 and Male #2, but they aren't super close.
Combination of the boys and girls
Male #1 knows Female #1 due to them being siblings.
Male #1 knows Female #2 due to the fact that she's being tutored by his cousin, Male #2, and her being close friends with his sister, Female #1 - but they aren't close. They just know each other, but they don't really speak.
Male #1 doesn't know Female #3.
Male #2 knows Female #1 because they're cousins and they've always been pretty close.
Male #2 knows Female #2 because his cousin, Female #1, asked him to tutor her in her schoolwork.
Male #2 does not know Female #3.
Male #3 knows Female #1 because when he first moved to the small town nearest to the Red District, he happened to walk upon her being robbed by a couple of muggers near the bar that he was taken in at. He defended her and managed to protect her. They've been friends ever since. They aren't best friends, but they're close enough that they hang out frequently.
Male #3 only briefly met Female #2 because of Female #1, but only remembers her face and name, not who she is.
Male #3 knows Female #3 because both of them are friends with Female #1.
The Basics
Kai knows Jou due to her seeking out a tutor, and one of her friends is related to him (Avazona, who is Jou's cousin), and recommended him as a teacher.
Male #1 and Avazona are siblings.
Zero and Eurydice know each other through mutual friends.
Now let me make this part as simple as possible. I'll split this explanation into three sections - How the guys know each other, how the girls know each other, and then how the guys and girls know each other.
The guys
Male #1 knows Jou due to the fact that they are cousins and went to the same high school and were in the same grade. Male #1 picked on Jou for their entire high school career because he found him to be a nerd. Once they got into college, though, they buried the hatchets and get along just fine now (unless the roleplayers who play those characters want them to butt heads still, which is A-okay with me, since this is just an outline)
Male #1 knows Zero because Zero has been friends with Avazona since they were young, after he left his home. They haven't been super close, but close enough that they hung out a couple of times together, normally with other people around. Due to Male #1's protective nature of his little sister, he's kept a close eye on Zero, since he's heard rumors of how dangerous he is.
Jou and Zero do not know each other.
Now for the girls
Avazona knows Kai because they were in the same class and grade all the way up until high school. When Avazona hit high school, she skipped her Freshman year, and then ended up skipping her Junior year too due to her grade and intelligence when it came to academics. Avazona and Kai remained good friends despite this, and Avazona always tried to help her with her schoolwork - obviously to no avail. She introduced Kai to Jou in an effort to help her with her classes.
Avazona knows Eurydice for similar reasons of her knowing Kai - they were in the grade and class up until high school. They weren't close friends, though. She also knows her because Eurydice is best friends with Avazona's cousin, Jou. They're friends, but not best. They talk but it isn't a big habit for them to hang out together.
Kai knows Eurydice because they've been in the same grade and class from elementary through all of high school. They've also been kind of forced together because of their connections with Avazona and Jou, but they aren't super close.
Combination of the boys and girls
Male #1 knows Avazona due to them being siblings.
Male #1 knows Kai due to the fact that she's being tutored by his cousin, Jou, and her being close friends with his sister, Avazona - but they aren't close. They just know each other, but they don't really speak.
Male #1 doesn't know Eurydice.
Jou knows Avazona because they're cousins and they've always been pretty close.
Jou knows Kai because his cousin, Avazona, asked him to tutor her in her schoolwork.
Jou and Eurydice have been best friends since they were little due to family friends.
Zero knows Avazona because when he first moved to the small town nearest to the Red District, he happened to walk upon her being robbed by a couple of muggers near the bar that he was taken in at. He defended her and managed to protect her. They've been friends ever since. They aren't best friends, but they're close enough that they hang out frequently.
Zero only briefly met Kai because of Avazona, but only remembers her face and name, not who she is.
Zero knows Eurydice because both of them are friends with Avazona.
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