Soundback: Kanade no Ishi

"Soundback - Kanade no Ishi-" is Hitomi's directorial debut film. Its story is described as "The protagonist Towako and her friends fight to keep the peace from robots that have attacked their idyllic country town by playing sound."

(Source: Crunchyroll)

Note: An in-movie anime for the live-action movie "Haken Anime!", based on the novel of the same name by Mizuki Tsujimura.