I will take her not voicing that Miyu died and only letting him arrive to that conclusion by being silent as a hint crumb that this Miyu is the real one and that the dead one is the fake one, thank you very much (absurd levels of coping, I know).
Just binged the available chapters, both female leads are just soooooo gooood, they both feel like a perfect match for the protagonist, I can't bring myself to root for just one of them!
WHAT DO YOU MEAN THIS IS ALREADY ENDING??? It had a cool and original premise, compelling characters and a main duo with great chemistry... Axe-kun sure is cruel...
Maybe it's a double personality sort of deal? OG Miyu's personality died and got substituted by New Miyu, who was dormant or way less dominant before, with their scenes together at school being allegorical.