How many Ranks and missions?

[Placek]

I just finished the storyline and I wonder is there more ranks beyond Rank 7? And how many missions there are on Rank 7? I hope extra content they plan to add will expand ranks and story, like in Burst editions of first two games.

[Arestris]

At least, Extra content will come, that's already announced.
"Class certification missions" with Patch 1.2, new story missions (after main story), with 1.3 and a time attack mode with 1.4.

Read more about it for example here: https://gematsu.com/2019/02/god-eater-3-versions-1-20-to-1-40-update-schedule-announced