Azufight Taisen Shiyo OST: 12B - Chiyo-chichi (Boss) (In-game Ver.)

This is the version of this song that plays in-game. This comes directly from the ripped .ogg files. Credit to RandomTalkingBush for the rip.
Azufight is a doujin fighting game based on the Azumanga Daioh series and developed by the circle 雪達磨. The real name is あ、対戦しよ～。
The OST is mostly(!) the show's soundtrack or character singles chiptunified. There are some interesting things that are pretty cool though.
Here's the official link:
www.dlsite.com...
You can download the OST here:
mega.nz/file/t...
Here is the game's DLsite page:
www.dlsite.com...
The game has recently been patched to run on modern systems.
You can download them here:
mega.nz/file/o...
(credit to jade_ midori for the Win10 patch)