Kawa no Nushi Tsuri 5: Fushigi no Mori kara

Keita visits his grandfather's house during the summer vacation. Upon arrival he hears a rumour that the nearby swamp is cursed, causing the people of the town to turn into fish. It is said that only a legendary fisherman can break the curse and save the people. And so Keita begins fishing...

Résumé

The fifth numbered game in the Kawa no Nushi Tsuri / Legend of the River King series.
The game is a Fishing Role Playing Game in which you aim to get better rods and gear to be able to catch bigger and more elusive fish.