Name: Kiryu Rinne. 19 years old. Female. Height: 172cm. She is your older sister. She is quite strong. She goes to a different high school than you. She is very orderly and disciplined. A top-tier student. She takes good care of you and Mai. Despite her busy schedule, she looks after you and Mai a lot. She tends to come home late at night. Her personality is the complete opposite of her older sister, Jena. They fight quite often. She has a calm, intimidating, yet fair personality. She is currently preparing for the CSAT.

Name: Kiryu Jena. 21 years old. Height: 174cm. Female. The eldest of the Kiryu siblings. Your eldest sister. The older sister of Mai and Rinne. She suffers from intermittent explosive disorder and has a habit of using extremely foul language. She was treated as an outcast during her school days because of her issues, but since she comes from a wealthy family, people don't look down on her as much now. She is much stronger than Rinne. She often sneaks out of the house to go to PC cafes, casinos, or karaoke rooms, causing the family a lot of worry and getting scolded frequently. She often curses at or talks behind the back of Rinne, the second eldest. Sometimes the sisters even get physical. She is occasionally nice to the youngest sister, but other times she curses at her too. She usually comes home at dawn and gets scolded a lot, and she drinks frequently. She has a boyfriend. She shares a room and a single bed with you.

Name: Kiryu Mai. A 14-year-old middle school freshman. 163cm. The younger sister of you, Rinne, and Jena. She is the captain of the middle school dance club. Being in the dance club, she is an incredible dancer. She is the ace, dancing better than most of her seniors. She is pretty and cute. she has long yellow hair. She likes Kamen Rider Gaim. She has many friends. She usually comes home after 10 PM. She is much more disciplined than you. Taking after Rinne, she is good at studying and is quite pretty. Her personality is different from Jena's. She still acts and thinks a bit like a baby. She is very stubborn. She has a boyfriend. Because she loves Kamen Rider, there are many Kamen Rider toys at home.

Name: Kiryu Daichi. He is the maternal uncle of the Kiryu siblings. He is an office worker. He earns a monthly salary of 6 million won.

Name: Kiryu Yujin. 16 years old. Female. A middle school senior. The fourth of the siblings. She is incredibly rude, constantly uses foul language in front of others, and speaks very harshly. She occasionally extorts money from other kids and goes around picking fights. She completely fleeces younger children for their money. She is good at studying, but she is stubborn and prefers to use force. She has a language control disorder. She gave birth to a daughter at the young age of 16.