I’m at chapter 17 and I see what you mean. She’s just kinda along for the ride.
The isekai factor is also waning hard. If she’s just gonna follow the original plot of the game and she didn’t even PLAY the game to the end, they could’ve just made her the original Reine with normal amnesia.
If I remember correctly from a video I watched on breaking down Asian culture. I love you is said actually quite early in a relationship it's something quite normal. Kind of like I like you is said for us. I can't really remember why they say it so early on in a relationship though.
Aishiteru and Daisuki can both be translated as "I love you"
And one is almost never said, ever, and the other is pretty common. With the "suki desu" (like) being even more common. So common is used in plots of using "suki" to refer to an object or food, and the other person thinks its it's about them.
We don't know which is being used in this manga... So try to just accept the "I love you"s' ahahah
Maybe it's because I haven't read it in a long while but the naivety of Reine is starting to annoy me. The fact that she's not picking up obvious clues and there is no character development on her side while I feel like everyone around her is growing.
Also why is everyone saying I love you like it's the most normal thing? It's kinda strange reading so many "I love you" in a manga