Major Land is a colorful world of music where instruments and notes come to life. During an annual concert event, Hummy, the cat songstress of Major Land, prepares to sing the "Melody of Happiness," capable of spreading happiness to worlds beyond. However, Mephisto, the king of Minor Land, interrupts the event and rewrites the score into the "Melody of Sorrow"—a dissonant composition that would instead cause despair when performed. In order to prevent this from happening, Hummy is tasked with finding the Precure, renowned warriors with an unmatched passion for music, and recreating the Melody of Happiness. Hummy arrives in Kanon Town, home of musically-inclined athlete Hibiki Houjou and studious baker Kanade Minamino. Engaging only in endless bickers, Hibiki and Kanade were formerly best friends and have since fallen out of touch. Their activities are stopped short by an unwelcome guest—the songstress of Minor Land, Siren. When Siren turns an important record into a gigantic monster, the girls' hearts resonate with the desire to protect what they hold dear and the two transform into the Suite Precure! As legendary warriors, Hibiki and Kanade will have to put their personal squabbles aside if they wish to protect the happiness of the world. [Written by MAL Rewrite]

Ayumu Narumi's older brother Kiyotaka, a renowned detective and piano player, disappears all of a sudden. The only clue Narumi has, are the Blade Children. Two years later a row of murders and incidents begin, relating to the Blade Children. Together with school journalist, Hiyono Yuizaki, Narumi tries to figure out their destiny. (Source: ANN)

An extra episode included on the 7th DVD.

Two OVA episodes are bundled as DVDs with each of volumes 6 and 7 of the manga. The first OVA is a prequel story written by the manga's author. Before the beginning of the main story, Rea and Chihiro have already met at a certain place: an outdoor hot-spring bath. The second OVA takes place after the series (effectively episode 14). The Furuya family finds a mysterious young girl hiding under the household temple.