The Sweet Secret of My Fiancée, Tsukiyo Higuchi

Ichiha borrows his fiancée's laptop and finds a sex tape of her with Seiki, the third member of their twenty-year friend trio, filmed before she and Ichiha ever got together. Tsukiyo's defense — "it's not cheating, that was before us" — doesn't land the way she hopes.

What follows is less a couple's story than an autopsy of one, as the confession peels back a longer sexual history between Tsukiyo and Seiki that the friendship had quietly buried. Loyalties bend, old memories get reinterpreted, and the three of them keep drinking together while everything underneath that ritual falls apart.

You read through Ichiha's side of the unraveling, choosing how far he pushes the confrontation and how much of the past he's willing to actually hear. The story branches toward multiple endings depending on whether he holds the relationship together, walks away, or lets Seiki and Tsukiyo's history run its course. It's a quiet, voiced visual novel about betrayal dressed up as an old inside joke.