"Pink Mizu Dorobō Ame Dorobō" is a short anime series that revolves around the misadventures of two rival thieves, Pink Mizu Dorobō (Pink Water Thief) and Ame Dorobō (Rain Thief), who compete to steal a mysterious and highly coveted treasure known as the "Rainbow Pearl." The story is set in a whimsical, fantastical world where rain and water play a central role in the characters' abilities and the environment.

Pink Mizu Dorobō is a flamboyant and confident thief who wields water-based powers, allowing her to manipulate and control water in creative ways. Her rival, Ame Dorobō, is a more reserved and cunning thief who specializes in rain-based abilities, using the weather to her advantage. The two characters are constantly at odds, engaging in elaborate heists and schemes to outwit each other and claim the Rainbow Pearl for themselves. Their rivalry is marked by a mix of comedic antics, over-the-top action, and moments of unexpected camaraderie.

The Rainbow Pearl, the central object of their pursuit, is said to possess immense power, capable of granting its owner control over all forms of water and rain. This makes it a highly sought-after artifact, attracting not only the two main characters but also other thieves and factions who seek to claim it for their own purposes. The series explores the lengths to which Pink Mizu Dorobō and Ame Dorobō are willing to go to achieve their goals, often leading to chaotic and humorous situations.

Throughout the series, the dynamic between the two thieves evolves, with moments of rivalry giving way to instances of reluctant teamwork as they face external threats and challenges. The narrative is driven by their interactions, the escalating stakes of their heists, and the unfolding mystery surrounding the true nature of the Rainbow Pearl. The series balances lighthearted humor with action-packed sequences, creating an engaging and fast-paced storyline.

The world-building in "Pink Mizu Dorobō Ame Dorobō" is imaginative, with a focus on the interplay between water, rain, and the environment. The setting is filled with vibrant landscapes, quirky characters, and inventive uses of the protagonists' abilities, which add depth to the narrative. The series maintains a playful tone while exploring themes of competition, ambition, and the unexpected bonds that can form even between rivals.