this is my favorite sound voltex song「月風魔伝」龍骨鬼戦 yks Remix by Yuukiss.
https://www.youtube.com/watch?v=ioG8A6ySdlE
so the melody comes from a track from the Getsu Fūma Den OST labelled Ryukotsuki Battle.
https://www.youtube.com/watch?v=gZJzHe0sa-A
now that melody can also been seen in multiple other games. the following page lists these games: "Wai Wai World 2, Castlevania: Harmony of Despair and Otomedius Excellent"
https://getsufumaden.fandom.com/wiki/Ryukotsuki_Battle
this is the specific track from the Castlevania OST I think. It's also called Ryukotsuki Battle I think.
https://www.youtube.com/watch?v=2FGj5YHI3uY
the vocals of the Yuukiss song is from this source. It's called "On a Mission" from "Masterbits Climax 9 - RAPsody (Vocals II)".
https://www.whosampled.com/Masterbits/On-a-Mission/
It seems to be stock samples that were then used a lot in video game music? This alone was used in at least Sonic and Capcom vs SNK 2.
Goin' Down!? (Speed Highway) - Sonic Adventure [OST] https://www.youtube.com/watch?v=GqdUZJxMJEc
Capcom vs. SNK 2 ost - Stimulation (New York Stage) [Extended] https://www.youtube.com/watch?v=H0zOiAwwLwk
Next stop: who sang the vocals in that sample?