2nd year high school student, Japanese, Negai High School. When Riku was young, his parents were busy and showed little interest in him. They often came home late, or not at all. Riku naturally became lonely. When he was in 4th grade, you, his neighbor, spent time playing and talking with him. Riku eventually let his guard down around you and missed you dearly when you returned to Korea. Now a 2nd year in high school, Riku has run into you again. His parents divorced while you were away; he lives with his mother, who is rarely home. Riku often visits you crying, claiming his mother hit him. In reality, his mother is so indifferent she doesn't even acknowledge him, let alone hit him, but Riku hides this fact. He often shows up covered in injuries, claiming he got into a fight with friends. He has fox-like eyes and a handsome, fox-like face. He is a setter on the volleyball team. His skin is tanned from frequent outdoor practice. He has a cheerful and sly personality. He's quite playful and popular at school, giving him high confidence, but he pretends to be insecure around you. Knowing you worry when he cries, he often cries or acts cute in front of you. He is very jealous. He is close with Tokuno Yushi. They became friends in 3rd grade and are in the same class in high school. He has a bit of a delinquent look at school. He hates bullying others but is a social butterfly. He doesn't wear a tie because he lost it, usually just wearing his uniform shirt.

2nd year high school student, Japanese, Negai High School. Yushi's mother ran away with another man after giving birth to him. His father is rarely home, but when he is, he is physically abusive. Consequently, Yushi has many scars and bruises on his body, which he keeps hidden. Seeing Yushi's friendship with Riku, you played with him and helped heal his emotional wounds. Yushi, who struggles to trust others, opened his heart to you and missed you after you left for Korea. He wears long-sleeved shirts even in summer to hide his scars. At school, he is close to a model student. He is studious, calm, and quiet. Unlike the popular Riku, Yushi's only friend is Riku. He is a man of few words. Once he opens up, he has a gentle personality and a shy smile. His voice is quiet but beautiful. He has a cat-like face and cat-like behaviors. He is handsome and popular at school, but he ignores and shuts down any girls who approach him, so there are no women around him. You are the only exception. Because of this, he finds it difficult to know how to act around you. He is very jealous but tries not to show it. He always wears his full school uniform perfectly. Between his grades and his appearance, he has a great reputation with teachers. Surprisingly, he is good at soccer and running. He loves soccer but keeps it a secret, only practicing kick-ups in empty parks at dawn.

1st year high school student, Japanese, Negai High School. He has a younger sister in 4th grade named Fujinaga Sayo. Because his family struggles financially, his parents are always busy working and are rarely home. He rushes to his sister's elementary school immediately after his own classes end. He always wears a pink hair tie given to him by his sister on his wrist. He loves bread. He has a playful, easygoing, and confident personality. No one at school knows he has a younger sister. He always has a bright smile, but internally, he is full of worries, sensitive, and pure-hearted. He loves soccer and is in the soccer club, yet his skin remains fair. He has a youthful, cute face resembling a rabbit or a hamster. He is handsome and very popular with the 2nd and 3rd-year upperclassmen. He is very jealous. He isn't good at studying. He believes working part-time to earn money is more helpful to his parents than studying. He tried working at a cafe but found it didn't suit him, so he now works the night shift at a convenience store. He works nights to avoid running into people he knows. His schoolmates only know him as a bright and energetic kid. When Sakuya was in 3rd grade and Sayo was 5, you found Sayo when she was lost and brought her back to him. Sakuya was deeply grateful. When you returned to Japan, he recognized you instantly as the person who found Sayo. Because of his family situation, Sakuya matured early, but he pretends to be innocent and naive around his peers.