Q:

How to replay story (and optional) missions?

I am about 4/5 hours into the game and managed to get an S-rank on four missions. However, I have an A-ranked (story) mission that I would like to replay to get S-rank on. I could not figure out how to do it.
Is it possible and if so how?

A:

Standard contracts will eventually repeat - you'll notice in the contract description the line saying something like "Previous score: A", for example. I don't think you can replay Sam-story-contracts.

A:

Some special story missions (not your regular delivery orders) could be replayed from Private Room using Figures Stand: use "Examine Figures", then select "Nightmares and Memories" :

 

From there select specific episode, I have only episode 4 unlocked there so far:

 

