Growing up in Pakse, Laos Ryusei was used to live in a far mansion at the end of the city. His mother was Japanese and his father was Laotian. They met when he was traveling to Japan and soon married, chosing to move to Laos because of his work. Both were coming from strict pureblood families, however each of them had their secrets. Jai Keo was a dhampir, while Ai Ishikawa was a vampire.

Despite the initial disagreement, their families accepted their marriage, but were sad when Ai moved to Laos. She was working as a magizoologist, spending most of her time with different plants, including those that used in healing. Jai was working at the hospital. After 3 years of marriage they got a boy and decided to name him Ryusei.

Since his childhood he knew he was different from other children. He wasn't fully human and his parents made sure to educate him about who he was and what he wasn't supposed to do. He attended a wizarding school, but as he got accused of misbehaving, he soon started to have a private education. His tutor was a strict person with his own ideals, and it made Ryusei think carefully before speaking.

When Ryusei was 7, his father Jai got an offer from Japan. After some discussion, the whole family moved to Japan. Privately his parents really wished for Ryusei to get to Mahoutokoro. Japanese language didn't bother the boy. He learned it from his parents and was communicating with his mother's side of family in Japanese. However, moving there to live proved to be harder. Fukui, Japan was his new home. His neighbor Kaito was the only one Ryusei became friends with.

Another mansion and being in Japan meant more strict rules, as his Japanese grandparents expected him to withhold high standard. His escape was guitar and sometimes meeting with Kaito. His private education continued after the moving. However Ryusei was never he happy and free boy he was in Laos. He became cold, more distanced. Everything his grandparents expected him to be.

When he was 8, after one year of moving to Japan, his grandparents told him that they're disappointed that he was a dhampir. Ryusei couldn't handle his anger and ran away to his room. Attempting to calm himself down, he grabbed the guitar and tried to play, but no matter how hard he tried, his anger was burning within him stronger than before. Some movement caught his eye and he saw a beautiful paper, in the shape of a butterfly, to levitate for a few seconds before landing back at the table. His paper butterfly he made earlier was another hobby that he kept private. And surprisingly, this was enough to let the anger pass. He sighed. He will get that beautiful potted miniature cherry blossom with the invitation from Mahoutokoro and go there, just like his parents wished.