1x14 - Mew Mew Power

Keiichiro begins making a beautiful birthday cake for someone, and the girls ponder whom it might be for. Later, Ichigo meets a woman named Rei studying butterflies. She later learns that Rei is Keiichiro's ex-girlfriend, and the intended recipient of the cake. Even though they separated due to their different interests and jobs, he continues making her new birthday cakes for her. The girls try to get them meet again to resolve their lingering feelings. At Rei's house, her spirit is stolen by Pie and Tart and used to make a chimera anima. With help from Keiichiro, they are able to defeat the monster and retrieve Rei's spirit. In the end, Rei and Keiichiro truly go their separate ways.