Synopsis: Upotte!!

On a quest to find Seishou Academy – a prestigious institution known for its students' unmatched skills in marksmanship – a substitute teacher gets lost on his way. He stumbles upon a summer festival and asks for help to find the school, where he is introduced to a girl with extraordinary shooting abilities. FNC, the assault rifle of Seishou Academy, leaves the teacher in awe, and he decides to enroll the next day. The students, including FNC, practice their shooting using M16s, surpassing the teacher's expectations. The experience at Seishou Academy leaves a lasting impact on him, but will it truly be unforgettable? Additionally, the 4-koma series Upotte!! Nano is also included.