While the series is primarily a supernatural action-thriller, the "Index" (the character) and "FLV" (likely a typo or shorthand for
: Often considered the most popular pairing (and the focus of the index of flv sex
: As the protagonist, Touma is the "center of gravity" for most romantic subplots. His tendency to save others—often at great personal cost—leads various characters to develop feelings for him, though his "unlucky" nature and dense personality often keep these from progressing to official status. The result
The creator later admitted they planted “romantic breadcrumbs” in the FLV metadata — not just for storytelling, but to let fans build their own canon . The result? A polyamorous finale voted on by index analysis, where Vex ended up with two partners, each path preserved in separate FLV branches. index of flv sex