Grateful King
Grateful King
Japanese Name グレイトフルキング
Romanized Name Gureitofurukingu
English Name Grateful King
Age Unknown
Gender Male
Birthday Unknown
First Appearance
Anime Episode 1
Voice Actress/Actor
Seiyū Hiroyuki Yoshino (Japanese)
Justin Cook (English)

Grateful King (グレイトフルキング Gureitofurukingu?) is a famous singer and composer, whose skills in composition and music was legendary to everyone in the Sound World.


King is contracted by Unicorn Virtual Music. Dagger Morse entraps King and forces him to compose a powerful song to make Morse the ruler of Sound World. Due to Morse's evil ambitions, King decides to possess the Legendary Instrument, Strawberry Heart, to rescue Cyan after she is brought to Sound World. King is able to communicate with Cyan through Strawberry Heart, but allows her to believe she is talking to the instrument. Now serving as Cyan's instructor in Midi City, he gives her advice on how to defeat dark monsters.


- King possesses this legendary instrument to rescue Cyan Hijirikawa after being brought to Sound World by Dagger Morse.