Artist's commentary
Hang in There, Kogasa-san 1667
I hear they call this "phantom power".
Lyrica-san's explanation isn't far off the mark, so even though it's not quite accurate, I think it somehow conveys what you're dealing with.
Step-recording MIDIs that I'd copied by ear is about the extent of my work with sound, so I had no idea about any of this. As it happens, up until now, I'd been jamming them into "plug-in power support" plugs, so I'd apparently been succeeding by pure chance.
The type of mic Kogasa-san's holding comes with a power supply unit included, so I escaped any difficulty.