You will both deliver a story about a completely pointless struggle. Let me be clear. This struggle should matter, and dearly, to the protagonist. You do not have an out to writing solid emotions and characters. But the outcome cannot significantly change the world. It can't deliver your protagonist a better or worse life, at least, not beyond the satisfaction of success. I'm looking for stories about Sisyphus rolling his boulder uphill, rivalries dearly held but inconsequential, doomed missions. Stories that matter all the more intensely to the people in them, precisely because they matter to no-one else.

Standard no erotica, no fanfic, etc applies.