Everybody goes to the ocean for a summer festival and the guys sneak off to a cursed island.

Shirotsugh "Shiro" Lhadatt may be a cadet in the Kingdom of Honneamise's Royal Space Force (RSF), but he has never been in space before—in fact, nobody has. The RSF is often regarded as a failure both by the country's citizens and a government more interested in precipitating a war with a neighboring country than scientific achievement. Following the funeral of a fellow cadet, an unmotivated Shiro is walking in the city one night, when he bumps into Riquinni Nonderaiko, a young, pious woman, genuinely enthusiastic about the significance of space exploration. As the two gradually bond, Riquinni's encouragement inspires Shiro to volunteer as a pilot for a prospective rocket ship, potentially becoming Honneamise's first man in space. Shiro and the RSF are soon joined by a team of elderly but eager scientists and engineers, and together, they embark on a mission to mold their nation's space program into a success. However, their efforts soon catch the attention of the government, which seems to have a different plan for the RSF in mind. Even as the odds are stacked against them, these men and women continue to stubbornly look to the sky, because somewhere among the frontiers of space may lie humanity's last chance at redemption. [Written by MAL Rewrite]

Unaired 13th episode of the TV series.

In the dangerous suburbs of Chicago, skilled bounty hunters Irene "Rally" Vincent and "Minnie" May Hopkins run Gunsmith Cats, a firearms store of questionable legality. One day, Bill Collins, an agent for the Chicago branch of the Bureau of Alcohol, Tobacco, Firearms, and Explosives, blackmails Rally and May into working with him on a case. The stakes are high, but Rally’s gunmanship and May’s knowledge of explosives are unmatched. As Rally and May unravel the secrets of the case, the two will need to use guns and grenades while being faster, stronger, and better than everyone else in order to stay alive. [Written by MAL Rewrite]