The anime is produced by Kyoto Animation, the company previously worked on the two TV anime series based on Full Metal Panic! novels, the second series Full Metal Panic? Fumoffu in 2003 and the third series Full Metal Panic! The Second Raid in 2005 (the first series was produced by GONZO).
The story centers around a high school student Seiya Kanie. On a Sunday, a mysterious transfer student
who carries a musket gun Isuzu Sento takes him to an old and deserted amusement park Amagi Brilliant
Park in Amagi-city, which is located in the western part of Tokyo. He is told that if the park can't attract
100,000 visitors in the next two weeks, it will be closed immediately. For some reason, Seiya has to save
the park as an acting manager.