Ren Tsubame's parents were unable to afford a daughter that they hadn't planned, so shortly after birth she was given up for adoption. Soon after she was adopted by a famous author, Saito Tsubame. Saito Tsubame was a famous author of mystery occult novels, so naturally Ren grew up well read in regards to mystery novels or occult stories. As the years went by Ren's knowledge of ghosts and such helped her make several friends at the primary school as her interest in the occult grew more. Her foster father's work was beginning to suffer as he ran out of ideas, so Ren, who wanted to help her father, began to learn more about the occult in order to help her father with her work. It was a child's interest at the time, so she didn't help much, but it was enough in Saito's eyes.
Eventually Ren entered middle school and what was a interest to help her father soon became a full blown obsession. Anything that was remotely mysterious began to fascinate her and she began to not only read and watch more occult books and movies, but also investigate haunted houses or grave sites. As time passed and her interests developed further, her bonds with others began to slowly break apart. She found herself not hanging out with her friends as much as she used to, but instead found herself hanging out in old abandoned houses or in her own room with a small pile of books. It was all of this long period of time that led up to one certain day though when she lost any friends that still chose to remain with her despite how she was with her interests.
One day Ren had decided to investigate the supposed "seven wonders" of her school, bringing along one of her friends who was on the student council to help her do so after dark when the school was closed. Naturally, Ren was ecstatic during her entire investigation, but was too caught up in it to notice that her friend she dragged along wasn't having a good time since dark places made her friend a bit nervous. When Ren had begun to take her investigation up the stairs and towards the roof, her friend had tried to convince her to stop the investigation for the night and head home, but Ren didn't want to. Soon a small argument broke out, and Ren's friend had accidentally stated that she thought this obsession Rin had was a stupid waste of time. Angered by this comment and hurt deep down, Ren shoved her friend, but had forgotten that they were on some stairs, so her friend had taken a pretty nasty fall down the stairs and had to be taken to the hospital. Luckily, the shoved girl only escaped with a broken leg, but wouldn't be able to participate in the sport she played in. That one single event crushed any remaining friendships she had, and made her a hated person in the school.
After that, Ren transferred schools and continued the last two years of middle school in a different place. She had decided to go there as a male since she felt more comfortable in the male uniform, which was easier to move around in for investigations than the basic female uniform. This caused many people to think she was a boy, which Ren had just decided to go with since she found it easier to investigate as a boy then she did as a girl. She did not go out of her way to socialize much with others at her new school, preferring to spend time delving into the mysteries of the occult. Since she seemed to be distant from the others and had a strange appearance, she was seen as a mysterious "bishounen" at her new school.
Time passed on by normally for Ren after that for the next two years, and soon she was at her first year of high school. Luckily the school she went to did not have anyone who recognized her there, so she was able to continue as normally, or so it would seem. By the time of near the end of the second semester a student had transferred in that had gone to her old school. It was one of her former friends who now hated Ren for what she did on that night. She immediately recognized Ren and at the school festival, exposed Ren's secret in front of many people by showing them a photo of her in her female uniform. At first, Ren did not mind, but things began to get a little out of hand. What few friends she had made there were driven away from her by those that bullied and teased her for coming dressed as a male.
Unable to take the pressure of being bullied and hated anymore, Ren decided to transfer schools to an entirely different city. Her foster father decided this was best for Ren as well, and found her a nice apartment in Kagurazaka City for her to live alone and go to the high school there. Near the end of the vacation she had managed to move into her new apartment that her foster father paid for, and now that she had spent the needed time getting used to her new home she was ready to transfer to Kagura High. She had decided to go there disguised as a male since she felt more comfortable in the male uniform than she did in the female uniform.