Dr. Slump harbors a secret love for Ms. Yamabuki, yet struggles to confess his feelings. Their world turns upside down when they stumble upon a mysterious videotape left by Dr. Slump's father, revealing a potion that induces love for Dr. Slump. The bizarre recipe calls for Dr. Slump's nose dirt and King Gyasuka's tears, sparking disgust and curiosity. Determined to create this potion, Dr. Slump embarks on a wild adventure to Under Island, home of the infamous Great Evil King Gyasuka. Despite his comical blunders, aided by the powerful Arale and Gacchan, Dr. Slump faces this daunting quest with newfound courage. Will this unlikely trio succeed in fulfilling Dr. Slump's heartfelt wish?