question is, what does satoha means by partner?
its either:
1. Satoha was once Teru partner (junior championship is a team match)
2. Teru is like 2nd to the worlds junior champions
3. Teru is World's junior champions partner (as in friendly term)
This just reminded me that after they get done with this, there will need to be a world championship match. Much like Berserk, Saki will not conclude till 100 years after the author has passed away.