Garu-chan received a call from the port town police station and was assigned to the case of the missing jewel. Garu-chan headed to the scene of the incident with her child on her back and began searching for clues. She listened to the story of the family that owned the jewel and started investigating their movements. Garu-chan discovered the family's secret and was getting closer to the truth of the case. However, the case took an unexpected turn, and Garu-chan was forced to look for new clues. Garu-chan investigated the family's relationships and identified the person holding the key to the case. Garu-chan was able to solve the case and recover the missing jewel.