I admit I started watching this because of the amount of pictures and gifs I saw on my dashboard on Tumblr.
I read the story plot and thought "why not?" so I downloaded it and watched it through a weekend.
To be honest, the first episode left me a bit confused and my first thought was "what the hell is wrong with Sanada?!".
Not sure what to expect, I kept watching it and I'm glad I did: this has become one of my favorites.
It's the story of four very different people getting together through fishing, which helps them develop a strong friendship.
Through this, they realize what's really important for them and that together they can achieve great things (like catching a big tuna or saving the world).
One of the things I enjoyed the most was the art: the anime is full of bright colors, the drawings of the landscape were impressive.
What this anime lacks a bit is more background story for the lead characters: although we know almost everything about Haru and we are given lots of info about Natsuki's past, not much has really been said about Yuki (just a bit in one episode) and basically nothing about Akira.
I don't really mind these omissions, because the story flows just as well without them, but I'd have loved to know a bit more.
Overall I truly enjoyed this anime: it was funny, sad, absolutely hilarious and really touching.
I highly recommend it