I wonder if Aimi will find a way to kill her timeline's version of Flare's real body in the hospital via Megumi's timeline. That is the only solution I can think of. I'm not even sure that makes sense though, time travel is so confusing.
It's also very ominous that the senpai's dream of the "god's tower" is actually the tower that the same senpai exploded to help Aimi, Flare, and Nako escape. :x