Kawa No Nushi Tsuri: Wonderful Journey Cheats (PS2)

Talk to the lady near the well, and she will ask you to get her a Rainbow Trout. After you
give it to her she will give you a treasure map (from the Jiza 30 paces east, 10 paces
north, 5 paces west). Go under the tree by your house and dig to find the treasure. You
must do this to enter the fishing competition.

You must fish for Ayu in the competition. Go to the billboard, have your basket empty,
raise your HP, and use fish eggs that you buy from the store. Go all the way downstream
and fish where you see a blue person on the ledge in middle of the stream.