Aoharu x Machinegun

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".

Toru Yukimura, an S&M ero-manga artist is introduced as the third member of "Team Toy Gun Gun". Yukimura seems rather displeased with his new team mate, but will they manage to pull it off and win as a team despite everything?

The black envelop is a special invitation given to a chosen few who have earned the right to be in a special Survival Game tournament, those given to the members of Team Toy Gun Gun and to a certain man dressed in a white lab coat, who works as a pediatrician.

Yukimura clashes with Midori, as some past issues concerning Masamune and their past feuds were brought up. Caught in a rifle accuracy test which she fails at, Hotaru goes up against the gun store manager as her last resort to win her G3 SAS gun.

Hanako was asked by Masamune for Hotaru to join her team instead, for the day. Later on Hanako found out why Masamune wanted Hotaru to know more of the basics to the game, to bring out the hidden talent that Hotaru may have.

A competition is starting soon, Hanako is surprised by how many are competing in it. While as others plan ahead.