Maou Damashii (魔王魂)
戦闘曲02b
Credit line
音楽：魔王魂 "戦闘曲02b" https://maou.audio/game_battle02b/ — CC BY 4.0
Where to put it: Anywhere in the work; on YouTube in the video or the description. 魔王魂 may also be written まおうだましい or MaouDamashii.