MONDO GROSSO is the Italian word for “BIG WORLD" and its English title is “BIG WORLD.” The album was created in the midst of historical changes in the world, and is based on the concept of "a musical journey that continues to search for the place of the heart in a world that has changed and is changing even more.

The song "Planet Tantra" by MONDO GROSSO explores various themes and combines them with poetic imagery and metaphorical language. The lyrics suggest a sense of losing sanity or rationality, as indicated by the line "Joy to the world, 僕らはとうに正気を失くして" (Joy to the world, we have long lost our sanity). This could be interpreted as a commentary on the chaos and disconnection prevalent in society or within oneself.