Itadaki Shunpei!!

Shumpei Ohki is a high-school student who hunts for treasure at his father's request. He travels to Kalimantan to retrieve a ruby ball, encountering a rival group known as the Dark Star Gang, who also seek treasure balls globally. Shumpei successfully acquires the ruby and returns to Japan, but Paucha, the guardian of the ruby, pursues him to his family's home.