Oh dear. Oh dear. Yet another Victorian morality tale dressed up as a story of modern sexual freedom.
A sort of updated struwwuelpeter (without the humour) to shock the middle class viewers, the target audience (I suppose) for this sort of internalised non-drama. The audience can then nod their heads sagely when inevitable disaster overtakes the promiscuous youngsters.
The sub-genre works like this: Take a bunch of wealthy kids in their late teens, they don't have to work so, for the want of anything better to do, they gather to experiment with sex which seems like a good game until it leads them into obsession and tragedy.
In this case a boy obsessed with filming everything creates a club where participation requires each member to bring a video of their latest conquest for them all to see. Ho hum. Someone dies at the end. Who'd have thunked it?
Review of Hymypoika
