In this follow-up to the series, four siblings have completed their parents’ intense training and have become bona fide agents. When the proprietor of a well-known fruit juice company seeks their assistance, a fresh adventure unfolds for the Sibling Team. A villain has acquired the fruit juice recipe and plans to use his secret concoction to make all children as miserable as he is. This time, the entire family—mother, father, and siblings—must unite to tackle this formidable challenge. The Sibling Team, alongside their parents, harnesses the power of love and intelligence to thwart Kubi. Not only do they stop him, but they also manage to bring out his better nature. In the end, they receive unexpected news from their mother: the Sibling Team is expanding from four members to five, as a new sibling is on the way.