Nushi is the greatest river monster.
You can do fishing in the fishing spot in actual Japan, and can fish the fish which can actually be fished.
Even if you are dark night and you cold in winter, you can do fishing.
Let's Nushi Fishing!!
(Caution:Sorry now, This App language is Japanese only. English version is here!! https://market.android.com/details?id=com.tsukamall.en )