The streaming platforms also host digital soundtracks from 8-bit Famicom titles "Downtown Nekketsu March Super-Awesome Field Day" and "Downtown Special Kunio-kun's Historical Period Drama." Both Kunio-kun series installments are featured in Double Dragon & Kunio-kun: Retro Brawler Bundle for Nintendo Switch and PlayStation 4.
From the product page:
Mystery is afoot once again for Kunio and his River City pals! One night, Kunio is attacked by two mysterious individuals. On top of that, Riki's girlfriend has disappeared, and it's up to Kunio to find out the truth! Kunio has just 3 days to unravel the mystery, and he'll need your help to take down all who stand in his way...Spotify - ダウンタウン熱血物語SP ORIGINAL SOUND TRACK