Roge Undines , born in a deep sea in the 10th century , close to Castelobruxo. When Rose was 11 years old , as a young half mermaid girl , had to leave her team and find her own way , to start her life . Full of curiosity , to see how the 'up'* world for her is , she went out . She realised that she wasn't a mermaid anymore .

Five years after , she found Castelobruxo School . It was like an abandoned house . When she went in , she saw two young male wizards fighting . She didn't knew what to do so she started singing to calm them . Her voice out of water was really awful , that birds left when they heard her . Harold , one of them asked her , were she was from ? Roge didn't want them to  learn about her real form so she left .  She tried to change herself into mermaid but she couldn't . Not even water could , so she went back to Castelobruxo to find them and talk with them.

They were too close with each other after years . Harold and Apollo wanted to make Castelobruxo a School , so they asked Roge if she wanted to be their final member . She accepted it .