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A second year student of Eiden school. Best friend of Hu-sen. Hu-sen and Rei were initially hostile towards the guys, especially Appo-. Eventually the guys managed to befriend them.
Rei was first seen soon after the guys transferred to Eiden school. After the guys were admitted to the nurse's office, Hu-sen and Rei reported a stolen piece of underwear to Mei. Appo- then wrapped the underwear on Kazushi's head and Rei recognized it as hers. She flew into a rage and beaten the guys up.
One day, the girls requested the Kazushi, Pierre, and Daigo investigate a strange presence in the girl's dormitory. The guys discovered that it was Appo- who was sneaking around the girl's dormitory after midnight. Rei assumed that the guys were all in it together and beaten them up.
During the school cleaning day, Hu-sen and Rei were at the alchemy laboratory when it caught fire. Kazushi and Appo- ran in to rescue the people inside, not knowing who they actually were. Kazushi found Rei combating the fire using an extinguisher in each arm. She then carried Kazushi out over her shoulder.
After Appo- became Hu-sen's boyfriend, she spent a lot of time with him causing Rei to feel lonely. Rin and Sakura found one of Kazushi's tie pins that he dropped at the laundry room. Rei offered to return it but instead used it to frame Kazushi for stealing the exam question papers. She was alerted to the sign posts and Appo- helped her escape. Rei then explained to Hu-sen that she missed her and Hu-sen promised to spend more time with Rei.
One day, Rei left something at the classroom. She returned to find but instead found Daigo raging in there. He knocked her over and she fell in love with him. Later that night, she met with Daigo at the school field. She revealed that she used to be tiny during elementary school and Hu-sen protected her from bullies. Eventually Rei experienced a growth spurt at 11.