Meruru is the princess of Arls, a little kingdom situated in the far north of the Arland republic. After her father and Gio, the leader of Arland, discussed the merging of the two lands, she met Totori, the now-graduated alchemist. Dazzled by the power of alchemy, and with a desire to help her country prosper, she forced herself on Totori as her first student. Her father initially disapproves of this decision, but agrees following a suggestion from Rufus. He gives Meruru a directive to use her alchemy to improve the kingdom, with several intermediate goals which must be met within specific time periods in order to be allowed to continue her alchemy work. Later, Rorona joins the two, but she has been turned into a child by Astrid after drinking an experimental potion of youth.