during world war one there was this pianist who lost his right hand and went around commissioning composers to write pieces for the left hand. listen to ravel's piano concerto for the left hand even tho it's only played with one hand the music it produces sounds so full and layered. heartfelt pieces can still be played even with one hand, all you need is a good composer
(perhaps akari's dad can dedicate himself to composing such pieces for his daughter)