You really have to be interested in a basic fishing game to want to play this.
Definitely a 6.5 to 7 / 10
If you don't like fishing games, don't play it. Its easy to be drawn in by the cover. (Just like books, never judge a game by its cover).
In conclusion: The anime aspects of this game, while there, are minimal. The game provides mild fun, for small periods of time. (i.e. 1-2hrs at a time) Its not a game thats meant to be played at all once. For trophy seekers, the games overall difficulty seems to be at about a 3-4 though I do not have much time into it. I'd assume for a platinum it would take about 15-20hrs, Maybe less maybe more.