The three researchers, Runi-chan, and the professor embark on an adventure carrying radioactivity in a in a dropper. In this comic, the "radioactivity" has the power to change the size of objects and bring the dead back to life, giving us a glimpse into the dreams and hopes of science and technology.

This is believed to be the first time the series has been published in book form. It is packed with content, including the title story, "Mifune," "The Secret of the Mummy Tower: Adventure Bencha," and "Adventure Prince."