She could face a lot of challenges. For one, the language barrier would be difficult. She'd have to learn Japanese to communicate and study in the new magical environment. Also, the Japanese magical society might have different views on her status as an outsider, and she might have to prove herself worthy to be part of their community. However, she is Harry Potter after all, so she would likely adapt and grow in this new setting.
The plot could develop with Harry being abandoned in a big Japanese city like Tokyo. He might end up in the muggle part of the city at first and have to use his wits to get by. Eventually, he attracts the attention of Japanese wizards who are both curious and cautious about him. They take him to their magical enclaves where he discovers that there are different types of magic in Japan. There could be political intrigue within the Japanese wizarding community regarding Harry, with some seeing him as a threat and others as an opportunity. He has to navigate through all this while also dealing with his own feelings of abandonment.
One interesting fanfiction could be where Harry Potter is abandoned in a small Japanese village. He might discover the local magical traditions that are different from the British ones. Maybe he meets a kind Japanese wizard family who takes him in and he has to adapt to their way of life, like learning about Japanese magical creatures and spells.
Well, her Hogwarts - centered story would completely shift. Instead of going through the trials at Hogwarts, she'd be dealing with the Japanese magical schools or training systems. Maybe she'd end up in a school like Mahoutokoro, where she'd have to learn different magical techniques and rules.
Well, the magic system might be integrated with Japanese folklore. For example, instead of wands, they might use something like Japanese talismans. And Hogwarts could be a Japanese - style castle or temple - like structure, with different houses representing different Japanese clans perhaps.
In this kind of fanfiction scenario, it would be really interesting. Harry might have to adapt to Japanese culture while still having his magical abilities. Maybe he would attend a Japanese wizarding school that has some unique features inspired by Sekirei. For example, the school could have some sort of spirit - like the Sekirei - associated with it in a magical way.
Another difference is in the social structure. Japanese society has its own values and hierarchies, which can be reflected in the fanfiction. So, relationships between characters might be different. In a Japanese - inspired Hogwarts, for example, there could be more respect for elders and a different way of handling conflicts among students, which would be interesting to explore in the fanfiction.
Perhaps he'll meet a mysterious old wizard who lives in a secluded temple in the mountains. This wizard could be a master of ancient Japanese magic and could teach Harry about the spiritual side of magic that is deeply ingrained in Japanese culture. Harry might also meet a group of young Japanese witches who are training to become magical healers. They could share their knowledge of Japanese magical plants and how to use them for healing, which would be very different from the healing methods Harry learned at Hogwarts.
He might turn to his studies more intensively. Since he has no friends to distract him, he could pour all his energy into learning new spells and magic, becoming more powerful in the process.
Well, he might go to a Japanese wizarding school. It could be a place where they combine traditional Japanese magic with the spells he already knows. Maybe he'd have to learn to use a magic katana instead of a wand!