Royal figure of the floating Rakuga Kingdom, a realm sustained by Earth's scribbles and doodles. Her kingdom faces collapse as human doodling declines due to increased digital device use, threatening both realms. Actively seeking solutions, she initiates the search for a hero to wield the legendary "Miracle Crayon," capable of generating energy through drawings. This quest leads her kingdom's military to forcibly conscript children in Kasukabe to produce scribbles.

Her role shifts from passive royalty to active participant as the situation escalates. The Miracle Crayon ultimately finds its wielder in Shinnosuke Nohara, a young boy whose unpredictable creativity proves uniquely compatible. The Princess then aligns her efforts with Shinnosuke and his allies, the "Almost Four Heroes," confronting the Rakuga military's oppressive tactics to restore balance.

Doodle-based entities of the Rakuga Kingdom possess a critical vulnerability: they dissolve when wet. This weakness becomes pivotal as impending rainfall threatens to erase the doodle soldiers and structures. The Princess's fate intertwines with the conflict's resolution, culminating in collaborative efforts to protect both Kasukabe and the Rakuga Kingdom from mutual destruction. Her actions help reconcile the kingdom's need for energy with Earth's autonomy.