When Seya was ten years old and until he turned fifteen, he travelled with his mother, but from time to time he gave an excuse, like going to visit Princess Heiji or checking his fields or going hunting, and he escaped from his mother's sight to travel alone. On some of those travels, he indeed went to meet the Princess, and he took her with him. Other times, he went all alone.
This time, he thought it was a good idea to visit Princess Heiji and dare her to do some fighting underwater. Like that, she had to fight without using her Fire Magic.
Seya told her many times that she couldn't rely only on Magic, that she must also train her body and fighting skills, but because the Princess hated losing, every time they fought, and she found herself almost losing, she always threw an enormous am
