Goraku Ou Tango! is a Japanese Game Boy Color game. The title suggests a game in the genre of rhythm or music. "Goraku" often relates to entertainment or amusement. "Ou" means king.  "Tango!" indicates a rhythmic element.  Without additional information, specifics about the gameplay and developer are unclear.  Its limited availability makes it a relatively unknown title compared to more internationally released games.

Goraku Ou Tango! (Japan)

Golf de Ohasuta (Japan)