Bumbu is a sentient vehicle hatched from an egg, emerging as a bright yellow car capable of speech and movement. Partnering with an eight-year-old human named Ken, Bumbu embarks on a global journey to locate its mother. Throughout the expedition, Bumbu exhibits an innocent and playful personality, frequently engaging in races with other sentient vehicles encountered along the way. A distinctive trait allows Bumbu to gain enhanced speed and strength when exposed to floral scents, consistently leading to victory in these competitions.

The journey involves numerous interactions with diverse individuals across various regions, often resulting in Bumbu and Ken assisting those in need. Persistent antagonistic forces pursue Bumbu, motivated by desires to obtain this unique sentient vehicle for personal gain, necessitating continuous evasion and resistance. Progressing through multiple environments and scenarios across 130 episodes, the journey gradually reveals Bumbu is not alone, encountering other similarly communicative entities.

Character development occurs through accumulated experiences, facing challenges, and forming alliances during the global expedition. The central driving force remains the goal of reunification with Bumbu's mother. This objective achieves resolution when the maternal figure is successfully located and reunited with Bumbu, concluding the primary narrative arc. The documented adventures are contained within the original televised series.