Not wanting to shock her or make her angry at him, Nagihiko kept the secret of his true identity from Amu. Later, Tadase and Kukai were going to tell the Guardians about Nagihiko's true gender, but Amu got to them first, and told them that Nagihiko was Nadeshiko's "twin brother," since she still didn't know the truth. After freaking out about the real Nagihiko, Kukai calmed down and welcomed Nagihiko as the new Jack's Chair, since Nagihiko obviously couldn't go back to Queen's Chair now that he was a boy, and Kairi had left, leaving the Jack's Chair open. Tadase just smiled at him and said, "This is who he really is.", revealing that Tadase had known about Nagihiko's true gender since the start of the series. Kukai was confused and asked why "she" was dressed like that, since he didn't know of Nagihiko's true gender. He came back a few minutes later as Nagihiko, in a boys' uniform. They were both glad to see him, but he quickly excused himself to go change. He first arrived at the academy as Nadeshiko, and Kukai and Tadase were waiting for him. He had missed going to Seiyo Academy and all of his friends, so he cut his tour short so he could return to school. In the next season, he returned, as a permenant Nagihiko. Later, Amu learned of Nadeshiko leaving to go on her tour from the Guardians, and starting crying because she was her best friend. Amu, being gullable, took this as a perfectly good excuse, and hung out with him the rest of the day. To keep his secret, Nagihiko told Amu that he was actually Nadeshiko's twin brother (since they look so much alike). Amu first met "Nagihiko" when he was escaping his temple to get away from dance lessons. When he is in Nagihiko mode, he lets down his long hair (instead of keeping it up in a ponytail like "Nadeshiko") and he wears suit coats and jeans.
However, it was in this episode that "Nagihiko" was first shown. It was in this episode, that Nagihiko's mother explained that Nagihiko had to remain a girl because of their family tradition. So his mother agreed to let him take a world-wide tour to learn and be an apprentice to dance masters in numerous countries.
Nagihiko had been wanting to master all of the dances of the world, not just traditional Japanese dances. Nagihiko was believed to be a girl throughout most of the first season, however, his real gender was revealed in the final episode "Nadeshiko" was shown. He even successfully spoke in a gentle, feminine voice without a hint of masculinity in it.
He was seen dressing in cute dresses, gossiping about cute boys, and being the older sister/mother of the guardians. Over the years he lived as a girl, he adapted to the feminine lifestyle very easily. Therefore, Nagihiko took on the form of Nadeshiko, a graceful, elegant, and mature girl who became the queen's chair in the guardians. Nagihiko grew up in a family where it is tradition for the males to live as females for most of their childhood. However, he was not introduced as Nagihiko, he was introduced as Nadeshiko Fujisaki, the queen's chair in the Guardians. Nagihiko was first introduced in the first episode.