I'd like to explain why I'm judging Kaija so harshly. Considering the circumstances, their shared past, and, as it progressed, her puberty phase, I accuse Kaija of "Intent"!!! I hope I don't have to explain the word "Intent" now.
She made a very conscious decision and then, for whatever reason, missed the opportunity to tell the MC. And I don't accept the argument that she tried to tell the MC "cryptically" either. Our dear MC didn't grow up with a crystal ball if he doesn't have a clue about anything.
The Dev is now resetting everything in Kaija's love path, as if nothing had happened, and for a very, very good reason and intention. What also comes with this situation is the fact that Kaija has committed a breach of trust, and that usually means the end of a relationship. However, this VN is designed for Kaija and the MC to mend this breach of trust, but we all know that something always remains: doubt about the other person! And doubt is the slow death of a relationship!