Hatsumi's biggest fear since she was a child, due to him pushing her down the stairs. He turns Hatsumi into his personal slave, but also wants her as his girlfriend. Although he seems to be a complete jerk to her, there are times when he lets his guard down and cares about her and ends up falling in love. At the beginning of the series, he is a second-year student at the prestigious private school, Kaisei Academy. It is revealed that when Hatsumi and Ryoki were kids in the company housing complex, that Hatsumi was Ryoki's sole friend, while Hatsumi was also friends with Azusa. Nevertheless, Ryoki did not treat Hatsumi well, even as children, going as far as pushing Hatsumi down a flight of stairs, emotionally scarring her. This was revealed later to be an unintentional accident. (from Wikipedia)
Ryoki's dorky best friend, who is also a friend of Hatsumi. His hobbies are video games and anime (especially Gundam) and also, collecting models and action figures. He develops feelings for Akane, even though she often scares him, coming on too strong with her forward ways. He is finally able to show that he loves her by finding "Rare Bears" for her. At the beginning of the series he is a second-year student at Takazono High School (Class A). At the beginning of the series it is implied that Subaru has a crush on Hatsumi, but later on he comes to reciprocate her sister Akane's feelings.
Ha Ji Kang was really crybaby and girlish when she was young, after her two brothers bullied her and the boy she trusted didn't help her she took the problem herself and got more powerful. She became the jjang [leader in the street language] of a gang for a while. With Han Seo Jang's charisma and assistance, Ha Ji Kang had no problem conquering other gangs. The incident that changes Ha Ji's life forever happens when Ha Ji and her gang were heading to a fight. On the road, Ha Ji's motorbike slips while trying to speed Han Seo down and Ha Ji becomes brain dead. Her soul was taken into Aram Han's body. (Inspired source: http://www.anime-anime.com/lore/article.php?id=012 )
Kazuki's friend and classmate.
Han Seo Jang is the 3rd son of a president that owns one of the largest company and has a background just like Sin Uoo Bak. He is Ha Ji's subordinate in the gang, and is a violent character who is very possessive and appears to have a crazed side to him. He is amused by Ha Ji and therefore follows her, letting himself lose to her in the fight to become gang leader. We often see him as a serious person but whenever he is shown together with Ha Ji, there is a certain lightheartedness to his character, making him endearing in some ways. Because of him, Ha Ji gets hit by a truck and becomes comatose. Ever since Ha Ji's accident, he becomes much more violent and deadly. Originally, Han Seo was much stronger and skilled than Ha Ji, the jjang of Doberman. The only reason that Han Seo did let Ha Ji become his boss was his feelings toward her. While in havoc, Han Seo encounters Aram (when Ha Ji's soul was in Aram's body). Han Seo couldn't trust what he was facing. The way Aram talked, the way Aram acted and the way Aram thought was exactly same as Ha Ji's. Han Seo did not want to believe that Aram was Ha Ji but Aram was too similar to Ha Ji which kept bringing the incident to Han Seo's mind. About to go crazy, Han Seo attempted to rape Aram with his gang. At the moment, Ha Ji woke up from her coma (Aram's soul used Ha Ji's body). Han Seo put Aram's case aside and hurried to greet Ha Ji. However, Ha Ji wasn't the one he knew. She was a completely different person. Facing another confusion, Han Seo really decides to mess Aram up. During this, Aram was wounded badly and was taken to a place to be raped by Han Seo. Shouting at Han Seo, Aram (Ha Ji still inside) jumped off the car and was hit by a truck. The real Aram died, as her soul vanish along with her body being killed from the accident. From this point, Han Seo becomes more emotionally unstable after being traumatized even further, thinking he killed Ha Ji twice. (Source: MU, anime-anime)
Kazuki a fourteen year old girl who never had a connection with her mother due to being the child of a loveless marriage. Persuaded by a friend one night she goes out and hangs out with a motorcycle gang. There she meets Haruyama.