The world is vast, and all sorts of strange things exist!

Although this saying might not be entirely appropriate here, it somewhat fits the situation.

In Huaguo, there are ancient martial artists, and various ancient martial arts techniques are quite abundant.

There are people like Helan Shan, a living Vajra, and others like Old Man Ouyang who have reached the Human-Celestial Realm. It's not surprising that the Japanese have some unique traditions.