Yua Mikami is not like the rest. She’s better. She almost always delivers and she sets the bar very high. In SSNI-432 fantasy she is the scandalous little sister of the girlfriend of this dude.
The action pace is slow at first, and things evolve in a very soft fashion. Which makes sense, since Yua is playing the seduction game, and a slow escalation makes sense. But our good dude fully surrenders to Yua temptations, (as you should).
By the end, (and hardly a spoiler ahead, since the plot is always the same), yes, they both get caught by the sister, and he gets dumped. But well, it’s not a bad trade-off since he just came in Yua’s face. That’s still, a winner in the lotto of life.