Nana and Tsukasa seemed to be well after Tsukasa's (Ex)gf showed up and left in anger (so that means Nana wins). They started to live together in a luxury apartment. But later Nana read Tsukasa's phone messages and discovered something that upsets her. She started to sleep with various people. But eventually they were back together and all is well.
But then again, everything I wrote here could be wrong. So check your raw to see how close I get. I don't quite understand chapter 7 as to exactly how they reconcile and be happily ever after.
This is a really odd manga that I wished were not axed. Nana is pure trash, and Tsukasa is a loser that relies on sugar mamas.
There's an Indonesian translation on Mangadex.
If I got it right, Tsukasa is very high-maintenance and Nana needs tons of cash to keep her happy and exclusive. The money she makes posting naughty pics on Internet is not enough. She keeps hiking up the prices, so she ends up losing all her fanbase. She's forced to turn to good old-fashioned prostitution, and we see her going to hotels with her johns and sleeping with them.
And then the manga ends. It's kind of an awkward ending, that makes me think it really was axed. There was still an enormous potential of delicious toxicity to explore here... sigh, too bad. Anyway, the last pages are just as you said: Nana and Tsukasa are living together in their new luxury apartment, and it seems everything will go well between them as long as the money keeps flowing. So, happy end (or something). 