Caserin (Japanese: カスリンCaserine) and Luverin (Japanese: ラブリンLoverine) are two Luvdisc that belong to Misty and her oldest sister Daisy, respectively. They acquired them in the Kantoregion, despite the fact that Luvdisc do not normally live in the area.
Meanwhile, Dr. Namba had concocted an evil scheme to rid the world of love and needed the two Luvdisc as his key components. To his aide, Butch and Cassidy were asked to steal the Luvdisc (in the original Japanese version, Dr. Namba only wanted them for his "R-project", not mentioning anything about ridding the world of love at all). His plans were ruined, however, when Caserin and Luverin were able to cooperate and save each other. Seeing Caserin's heroic acts, Luverin fell in love with him. Their mutual attraction finally allowed Daisy to complete her new show.
Personality and characteristics
Caserin was lovesick and easily saddened when Luverin would turn him down. However, with Misty's encouragement, Caserin was able to save both himself and Luverin, causing the latter to fall in love with him.