Yoshinaga, the president of a shipping company who borrowed money from Ginjiro Manda, was captured by Matsubara, the president of a construction company, and Kakizaki, an executive from Ninryukai, and encountered a rigging heron. At that time, Tokita, who was in debt to Ginjiro, escapes at night. Ginjiro sets a trap on Matsubara and Kakizaki to collect all of Yoshinaga and Tokita's debts.