I'm enjoying this AVN so far. I understand some of the criticisms directed toward the MC, but Lyria has returned as a love interest in the version I am playing. Unless Lyria is out of the picture again at some point, I'm assuming she will stick around after she essentially scolded the MC for abandoning her and told him that she is in it with him until the end no matter what, but admittedly I am midway through the story and do not know how much more content left there is or what may happen.
She kinda leaves again for a reason that makes a degree of sense to me considering her character's background and general take on the path Magnus is taking. That said it is not nearly as final as people are making it sound and all things considered there are plenty ways for her to be reintroduced into the story, to make her have much more impact.
As of where the story leaves off she has by far the least general relevance in terms of both capability and stake in the overall plot, and the only thing that makes her notable is the fact she was the first LI we were introduced to unless she gained some sort of power up and some sort of conflict or stake in the current situation it is likely for her to have been overshadowed, It makes perfect sense for her to be temporarily and organically removed from the story until she can be reintegrated in a situation where her presence can shine.
Like seriously Yana is now royalty and has a personal stake in Magnus' success outside of her relevance as an LI, in the fact that she needs him to be successful for her people to have a chance at not being stuck in the hellscape that is the demon realm. There is also the way she helps move him away from his past since he can now acknowledge and even appreciate the presence of a demon something that would have been unfathomable to his prior life.
Eris is a goddess, and has had a personal stake in all of Magnus lives due to her love, and has been quietly been helping him time after time even spending her divinity and breaking rules that would have led to her annihilation to save him and extend the lives of his parents when they should have died.
Aria is literally his right hand, his advisor in everything that has been so far and one of the strongest mages we have seen in the story to date, not only does she have a personal stake in his success since her life is tied to his due to her role, she is also a notable force in her own right and even with all of this she has still been relatively overshadowed by Yana and Amynth since they both just had mini arcs dedicated to them.
Amynth who is apparently a fundamental aspect of reality given form and sentience has pretty much been the focus of the past few mini arcs, and is literally fate tied to Magnus by some uber godlike being who is the creator of the verse and is meant to be a guiding hand to Magnus now that he is apparently The One's chosen soldier to right the world of it's many wrongs. Oh she is also the queen of a major world power to boot and the primary claim to legitimacy for Magnus's territory. In comparison Lyria's only significance is essentially the "childhood friend" role, since her claim to fame is really just the fact that she was the first LI he knew and we were introduced to.
Point is that all the others rn have stakes, strength and presence in the story that Lyria was lacking and unless something drastic happened that wasn't set to change which would have left her in the background of the others story wise for a good while, rather than let her rot in the background it makes sense to have her go her own way organically and reimplement her back into the story later on in a way that would give her more agency as a character and give her a similar level of significance to the others, this could be due to a conflict with elves since they hate Eris, maybe a power up that is forced upon her by Eris' sister making her a reluctant enemy and forcing Magnus to tackle a god personally, or maybe she reappears in some future plotline where Magnus is forced to contend with the guild and it's enigmatic leader. Those are just 3 plotlines I can see her coming back in and there are likely plenty more that would boost her significance and stake in the story other than being interested in Magnus since literally every LI can say the same.