"Lostorage conflated WIXOSS -missing link-" is a continuation of the WIXOSS series, focusing on the card game WIXOSS and its dark consequences for its players. The story revolves around a group of girls who become entangled in a dangerous battle known as the Selector Battles, where the stakes are their memories and identities. The narrative builds upon the events of previous seasons, particularly "Lostorage Incited WIXOSS," and introduces new characters while revisiting familiar ones.

The protagonist, Suzuko Homura, returns as a central figure, having previously survived the Selector Battles. She is drawn back into the game when a new iteration of the battles begins, this time involving a mysterious "missing link" that connects players across different timelines. Suzuko teams up with her friend Chinatsu Morikawa, who also has a history with the game, to uncover the truth behind the new battles and protect their memories. The story explores themes of friendship, sacrifice, and the consequences of one's choices, as the characters navigate the morally ambiguous rules of the game.

The antagonist, a mysterious entity known as the "LRIG," manipulates the Selector Battles, forcing players to confront their deepest fears and regrets. The battles are not merely physical confrontations but psychological struggles, as players risk losing their memories and sense of self. The narrative delves into the backstories of key characters, revealing their motivations and the personal traumas that drive their actions. As the story progresses, alliances are tested, and the line between friend and foe becomes increasingly blurred.

The series maintains a tense atmosphere, with high stakes and unpredictable outcomes. The card battles are intricately tied to the characters' emotional arcs, making each confrontation impactful. The plot is driven by a combination of strategic gameplay and interpersonal drama, as the characters grapple with the moral implications of their decisions. The conclusion ties together the overarching themes of the series, resolving key conflicts while leaving room for interpretation regarding the future of the WIXOSS universe.