The On-Gaku: Our Sound anime feature film saw a January 11th, 2020 debut that came and went without too much notice overall.
The film from Hiroyuki Ohashi was launched via a crowdfunding campaign and it has Kenji Iwaisawa directing it while Ohashi works on the designs and overall supervision.
With a home video release back in March 2021, the film is one that hasn’t had too much promotion or distribution beyond that.