The best way to summarize the Mitsurugi experience is that if you play the game using a controller, you can't set its volume to 15%, as it bounces between 14% and 16%.

The reason for this to be happening, is that instead of having volume be a global variable in which you set its value on a given menu, they made one variable for each possible volume. There's the var BGM_1, BGM_2, BGM_3, BGM_4, etc... and you cycle between them. Except, they forgot to make BGM_15.

Not even YandereDev fucked up like this.