A magical mirror grants two children the power of invisibility, propelling them into an adventure across Japan. PJ and Chelsea discover Dr. Drabble's invention, a mirror that renders them unseen, and they seize the opportunity for an escapade in Japan. However, their invisible exploits quickly reveal the complications and ethical quandaries of their newfound ability, forcing them to confront the consequences of their actions.

This children's fantasy adventure appears to be a lighthearted tale with a clear moral compass. The premise of invisibility and exploring a foreign country like Japan suggests a narrative focused on discovery and the learning experiences of its young protagonists. The explicit mention of a lesson about the wrongfulness of taking without paying indicates a didactic element, common in children's literature, designed to impart values alongside entertainment. The story likely balances whimsical elements with straightforward ethical instruction for its target audience.