Right around the middle of the 19th century, the dark overlords of the Late Tokugawa Shogunate ruled Japan with an iron fist. Because of this, the top idols in Shinsengumi are ordered to sing only Heaven's Songs to brainwash and subjugate the masses, making writing or singing any songs besides Heaven's Songs a capital offense. Enter: Sakamoto Ryouma and his Masters of the martial art OF ROCK! They must take charge as they change the old ways of a grumpy old guard while singing for what is just!