The adventures of a young Japanese samurai named Yohei who visited Spain in the 17th century, in a story loosely taking its inspiration from the travels of historic samurai Hasekura. Yohei survived in hiding to the present day due to magical powers, and accomplishes many adventures in modern Spain as a superhero.

Every night, when the museum closes its doors, the mironins, Blu, Low and Ro, three little drops of paint that live in the paintings created by the Spanish painter Joan Miró (1893-1983), come to life and immerse themselves in an inexhaustible universe where art and imagination reign.