Naka ga Warusugiru Osananajimi ga, Ore ga 5-nen Ijou Hamatteiru FPS Game no Friend datta Ken ni Tsuite.

Amekawa Shintarou and Haruna Natsuki were once close childhood friends who had promised to marry each other, but their relationship deteriorated after Amekawa became obsessed with an FPS game and drifted apart from Natsuki. They now barely speak and often argue when they meet. One day, Amekawa delivers some printouts to Natsuki, who has left school early, and enters her room for the first time in five years. Natsuki is not there, but he finds a high-end gaming PC displaying the results of a match from the same FPS game he plays. He is shocked to see her kill count and username—2N, the second-ranked player in the world, known as an exceptional sniper.