Atousa joined angry protests against Iran's rulers in 2022 that loyalists like Reza helped crush. Two years on, the two young Iranians' political views remain at odds, reflecting a rift that will shape the outcome of presidential elections this week.

Now 22, Atousa says she will abstain from voting in Friday's ballot to choose a successor to Ebrahim Raisi after his death in a helicopter crash, regarding the exercise with derision. But Reza, 26, a religiously devout member of the hard-line Basij militia, intends to vote, a contrasting view of the worth of the election that underscores the division in Iran between supporters and opponents of the 45-year-old Islamic Republic.

All six candidates — five hard-liners and a low-key moderate approved by a hard-line watchdog body — have been wooing youthful voters in speeches and campaign messages, using social media to reach the 60% of the 85 million population aged under 30.