Holy shit user get some reading comprehension.
>First, was the disease Kurumi had AIDS? That would make sense as to why she would never let Aiba fuck her but I'm not so sure now.
No, AIDS is spread by fluid exchange too, which they did plenty of. Her disease seems more like Leukemia or some other blood condition.
>Second, did Kurumi die? The girl at the end with Aiba looked similar to Kurumi but she had a mole on her face while Kurumi did not. This really confused me since the girl was acting like Kurumi and Aiba was treating her like she was Kurumi.
Yes, Kurumi died. The new girl is supposed to look like Kurumi, bit of a red herring, but her tits are too big, her personality is different, she has a mole, and she finds Aiba's fetishes weird.
>Third, If Kurumi did die, was Aiba able to fuck her at the end? It looked like he only jacked off to her.
No, no sex. Kind of the point of the series, That's why she says "when I wake up, let's have sex" - implying they never do.
She was never fucking the doctor, there's a lot of scenes meant to imply that but all of them can be explained by being, well, doctor stuff. Besides, doctor was happily married.
>Yes she died. It is unclear if she died after they had sex or during. But yes they did have sex.
No, it was very clearly not sex. Kurumi didn't want to have sex because she didn't want Hideo to throw away his future as an OB for her sake. They might have done some sumata, but it clearly says before they do it "let's jack off" or something. I dunno, the translations are pretty bad in the final volume desu. I need the raws.
>The girl at the very end is Aiba's new girlfriend, not Kurumi. It is mean't to show that he has accepted her death but also that he will never forget her. He is becoming a doctor so he can help others.
Interesting enough, though, she looks an awful lot like Kurumi. Maybe he just started looking for people that looked like her?