Scarlett: Nichijou no Kyoukaisen

Ohno Akito is a military otaku. Akito dropped out of school a year ago and is now camping on a small island off Okinawa, where he went in the forlorn hope that the American military presence would give him a chance to play with real guns. He's unexpectedly approached by a foreigner girl, Shizuka, who tells him he's in a restricted area. That night, Akito sees a B-2 stealth bomber flying overhead, and realizes something is happening that shouldn't be. The next day, as he's trying to break into Kadena Air Base to get a closer look at the B-2, he runs into Shizuka again...

Résumé

A port of Scarlett originally on PC, adds a new chapter.