Aoharu x Machinegun: Let's Start This Deathless Death Match

Hotaru Tachibana, a lively headstrong student council president, meets a strange mysterious man on her way home, waiting by her apartment door. On learning that her best friend was conned by a Host, Hotaru goes over to the Host club to deal with the person in question, who in turn challenges her to a Gun game called "The Survival Game".