Sgt. Frog - S04

A young Keroro wants to impress Pururu, so he shows off the Kero Ball-a ball Giroro borrowed from his brother, Garuru. While testing its buttons, he accidentally traps four tadpoles inside, forcing them to navigate a pinball maze to escape. Outside, a blue tadpole named Kururu finds the ball and hears their cries for help. He agrees to free them in exchange for a plate of curry rice. True to their deal, the Kero Ball produces the meal-but the plate keeps growing uncontrollably until Kururu is completely submerged in curry. The yellow curry begins to change him, turning the blue tadpole into the "yellow devil." As the screen fades to black, his eerie "Kukuku" laugh echoes in the darkness.