I don't think that quite counts for giving something back. She's just a damsel princess in need of rescue. She's not an active participant in it, like Mirei is.
The best way this manga could have gone was mc ending up with best girl mirei while having some kind of big brother/parent-child relationship between mc and fmc but of course she has to end up falling in love with the mc , so now the best girl have just 0 chances to win Even though mirei has a more organic relationship with mc
geez, the main girl a bit annoying and fainlly he wont have to wake her up or wash her, and this tenoji girl is the best, compared to the main bruh, the main girl only has beauty, unfortunately the perfect one gonna lose