It's now confirmed by Devs' Twitter profile pic that it is Tatsuta who gets kai ni. Dammit...
Well, Tenryuu got her summer CG before Tatsuta so maybe now they've switched it around to be fair. But poor Tenryuu, all this time and she still hasn't gotten the one thing she's always wanted.
Reference Materials: Dragon's Growth IllustrationI've known about you, Ten-san, more than the Imperial Headquarters.Flip artWhat will become of Ten-san?In panicReference Materials: Dragon's Growth IllustrationSo I've prepared reference materials about your Kai Ni plan.Reference Materials: Dragon's Growth IllustrationTenryuuFor this occasion, just cut the jokes and let me see it already!Tenryuu KaiI've grown wings......!!!I really wanna become one. I must—!"Mezase Pokémon Master" by Rica Matsumoto. The 1st opening theme song of the Pokémon anime series.