Sayoko -The Summer we Wished Upon the Stars-

Koichiro finally confesses to his seatmate Sayoko on a June afternoon, she says yes, and for a while their relationship is just two teenagers getting closer over a warm summer. Then a smooth, sex-obsessed upperclassman decides he wants a piece of it, and the story stops being about young love and starts being about how much of it survives him.

The plot is straightforward and doesn't pretend otherwise: a happy couple, an outside threat, and a slow erosion of trust as the upperclassman inserts himself into their summer. It's built as an NTR story first, romance second, and it never really hides which one wins ground as it goes.

You play Koichiro, watching this unfold rather than steering much of it. Choices are minimal, the path is linear, and the branching mostly shows up at the end in the form of a few different outcomes depending on how far things have gone by then. There's no combat, no stat grind, just a couple's summer sliding sideways one scene at a time.