I love the fence between them. Is it symbolic of something? I feel like it means something along the lines that Sen is still fenced in his naivety and Kai has woken up, so he's free to do as he pleases. Maybe I'm just over-analyzing though.
Yeah Sen! Of course you wouldn't leave things the way they are. (saving us fans worldwide...) Now that I think about it, the fence symbolizes their friendship. It was intact before, but as they progressed they found that it was cut short by someone else. In this case, Kai's father and the fight they had. Can Sen repair the fence? ...I think I love this series too much.