Well one thing is for certain, on her true ending Asumi doesn’t die there she just goes to sleep, and both of them did mention they will fight together, like in this story she is 1 in 1,000,000 that has a serious disease later on she can find cure or treatment. Something I know, this is rare in real life but in bishoujo games is sometimes common on a protagonist or other main characters with rare diseases, one thing like I said before Asumi doesn’t die there at the hospital, like Idofgrahf said is up to the player to decide so after that you guys make your own ending.
Almost forgot ChrisN