kim_zhu

The Kitauji high school concert band club had at one time participated in national tournaments and was a champion school, but after the club's adviser changed, they have not been able to even participate in the qualifying tournament. However, thanks to the newly appointed adviser's strict instruction, the students are steadily improving and build up their strength.

The "Seven Deadly Sins," a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a Coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom.