I think they have gone all the way. They live in the same room and everything.
http://www.mangago.zone/read-manga/ai_to_yokubou_wa_gakuen_de/mf/v07/c035/23/
What? They totally have full sex, I can't remember in released chapters but defo in later raws!
I'm pretty sure they haven't. Since with the school rules, they would be expelled if they did.
if i'm not mistaken (since i can't read the raw, so everything is based on the images) in the later raws they have done it. Gil lost his memory and couldn't remember Haru so long story short Haru made Gii remember and than they went to an hotel and they had sex. i could be wrong but i'll try to find the link
found it: http://www.77mh.com/201109/205683.html?page=29
pretty sure I was right and they went all the way :)
I can confirm that he gets his memory back, he gets it because when Haru leaves him gii starts crying uncontrollably and he literally becomes paralyzed even though he doesn't understand why (gii was serious about not being able to live without haru lol). The memories come back afterward. About graduation, I don't believe so. (Still need to catch up on reading the raws, haven't checked to see if it was updated since it was years ago haha).
I have one question has Gii and haru have gone all the way or just kissing and other stuff