Like maybe this is way off, but like.
Adrien never explicitly says anything or initiates anything in this episode that leans more toward one girl than the other.
Even when kagami leans in for a kiss, it seems more like hes going with the flow of things than implicitly eager. Like his expression barely changes, especially compared to kagamis face in this scene.
Same at the end of the episode. He doesn't even try to hold her or anything, even though we've seen time and time again that if he want to kiss someone, he holds them closer.
And throughout the episode, he makes a conscious effort to get marinette to stay with them, and looks really disappointed when she finally leaves.
But the thing that really got me was that at the very start of the episode, adrien liked a photo of both marinette and kagami.
If the show runners were going to imply that hes turning his attention towards kagami, why not just make it a picture of her alone? you could argue that kagami may not post selfies on the regular, but i bet she'd at least have pictures from fencing tournaments or training. Like they could have just as easily had him staring at this one from the same scene, or even picking it up or acknowledging it in some way when plagg speaks from above it.
But they used a picture including marinette, and adrien doesnt even say anything when plagg comments on him moving on.
Hell, they could have even included a nice soft-eye-contact shot when hes playing piano with kagami staring at him
And they did. But with marinette instead.
I think they left it vague on purpose.
Adrien and marinette are moving on from their crushes. But wouldnt it be a wild twist if adrien had moved on from ladybug to marinette? I think in part 2, adrien might reveal a crush on marinette instead, probably to kagami.
Like, im a multi shipper. If he ends up with either of them, imma eat that shit up. But i can read romantic coding. And i think it would be really cool if this happened.