The anime doesn't have an overarching story (not yet, anyway). It follows the daily life of Saitama, a superhero so strong he could defeat any foe with a single punch. Being so strong, he became bored and he's now waiting for a worthy opponent. Along the way he meets cyborg sidekick Genos, who adores him and strives to be as strong as him. Eventually, they join the hero association together, which is filled with hundreds of superheroes with different abilities and different rankings.
The heroes themselves are very exaggerated characters that are simply there to show how absurd superheroes are nowadays; having stupid names, weird abilities and an insane and unnecessary variety (considering that most of the heroes are weak and useless). However, each and every character, no matter how insignificant they are, has a distinct personality and many of them could still be developed. It was nice to see that every character was given attention, with some characters reappearing for a short period of time in later episodes.
The battles (that occurred quite often) were really good. The action in the series was very interesting and not repetitive like in some other anime. The only problem was with fights involving Saitama. Since he could defeat any opponent with one punch, the fights with him soon became predictable (and his bored expression didn't help making things more exciting).
Despite the occasional predictable fight or annoying character, the show was enjoyable enough for me to be able to overlook those things.
The soundtrack was amazing, with music good for both comedic effect and suspense that sometimes made the scene so much better. For example, once a character paused in the middle of a dramatic speech and the music just paused for a moment with it. This was hilarious, it's amazing how well it fitted the scene. The opening theme, "THE HERO !! ~Okoreru Kobushi ni Hi wo Tsukero~" by JAM Project is a song so intense you could lift weights to it. Some of the singers behind this song also sang opening themes for Dragon Ball Z, One Piece and Yu-Gi-Oh.
The voice actors were really good, too. Makoto Furukawa, the voice of Saitama, did an amazing job. Saitama's regular bored voice (that sounds so natural) and his serious voice sound so different you could barely tell it's the same voice actor. The cast is a great mix of senior voice actors (like Mamoru Miyano, Yuuki Kaji, Yuuichi Nakamura, Miyuki Sawashiro, Daisuke Namikawa and many more) and younger voice actors (like Kaito Ishikawa and Ami Naito). All of which are very talented.
The art was amazing at times and very simple in others. Saitama's face barely has any details most of the time, except when he is serious or experiences extreme emotions. The art in most of the non-action scenes is very minimal, but I don't think I've ever seen an anime with action so well executed (Natsume Shingo, the director, is amazing). But it doesn't matter if the animation was detailed or simplistic, it always matched the mood of the scene.
So, is this anime perfect? No. But is it worth watching? It is a must! The ending didn't really feel like the end and it opened a lot of questions, but this anime will probably get a second season anyway (and if not, you could still read the manga or the web comic). This anime is one of the best, probably the best of this season. It definitely deserves the hype and it should not be missed.
