Though they've dated since freshman year, high-school seniors Alex and Claire from Alex Strangelove have never done anything more than kiss, even though they're deeply in love. But when the happy couple finally make plans to spend the night together at a local hotel, Alex feels more confused than excited. He's sure he loves his girlfriend, but after meeting Elliot, an openly gay teen, at a party, Alex can't stop thinking about going to prom with him instead.