Sibling superiority can be a bust, and for Akiba who's taken a toll back during his childhood, he'd definitely stop at nothing to reclaim his throne as the more omnipotent one. Just as he's about to get Tykie's fur, another window opens which he's allured to.
Q: Do you think giving up one's life over Tykie's was the best option Kai had? What would you have done in her shoes?
Tykie, Kai and Akiba (c) Me