About How the Childhood Friends I Don't Get Along With Is My Friend in an FPS Game I'm Addicted To Osananajimi FPS Game Friend

"If I become stronger than you, then you'll stay with me forever, right?" Shintaro is the number-one ranked player in the world for a popular FPS. When he decided to enter the national tournament with the goal to become a pro gamer, he found out that 2N, the second-ranked player and his dual partner, turns out to be his estranged childhood friend Natsuki!? (Source: Hifumi Shobo, translated)