I really like this ending, didn't leave regret in mc this time.
Tenga remained true to his heart, you people most likely missed but spirit vessels were attracted to the princess subconsciously, sort of like brainwashing.
Tenga remained true to his heart throughout the story, although he did were "brainwashed" next morning after their smalltalk together when they summoned the True Princess and only remained in another world to serve his duty, nothing more.
The ending might felt rushed, but there really were nothing more to say, all spirits had vessels, kingdom had an advantage though that and summoning the real princess. This wasn't the main plot of the story, it was making a person value of oneself.
It's obvious that Kakura and Tenga relationship grew now and although she's still pretty timid, his now a bit trimmed down carefree attitude made her feel finally appreciated.
It was a good read. 9/10
Thanks for the scanlation to the very end!