New to a civilian world, an ex soldier freshly divorced from an abusive marriage, is forced to live with his PTSD twin sister while trying to build a business to pay the bills.

The PTSD sister is a complication, not an antagonist unless she is actively trying to stop him from achieving a goal. As Richiev suggests, helping her seems to be the goal, but I feel like there's a twist missing from the story that would make it more interesting. Just for example, if he took over his sister's store and discovered?a local gang is extorting it, it would not only be one way to explain her PTSD but defeating them would also give him a more concrete goal than just "building a business."

"When his sister suffers a nervous breakdown, a newly discharged Master Sargent navigates his way through the cutthroat world of small business?in order to help his sister's convenience store survive while she seeks psychiatric?help."

Does the sister have PTSD and not him? Was the sister in the army, too? Did she have a personal trauma that we need to know of?

This premise sounds like the beginning of a movie. We are waiting for a "Then..."

Of course, lots of dramas are just that. In that case, we probably expect to read more about the conflict of the story. Does the conflict come from the sister? What about her?