It is about otter people trying to change the world. The otters have human bodies and otter faces, and when they are fighting their hands turn to rock. At one point, one of #11's friends ( An otter with the face of a man called Hamada-kun) is captured by a tv crew and exploited. In retaliation to this #11 crashed his truck into the Television studio.
Shell 75: There are too Many Yoshidas in Japan
This chapter starts with #11 in an office and an employee (Yoshida) entering . #11 doesn't respond until Yoshida calls him by his full title "1st Advertising Department Manager Otter 11"
11 recognises Yoshida who has been working here for 8 years and begins to tell his story of how in two years he pulled himself through the ranks of society and became the Manager of the 1st Advertising Department at Hiraho Marine Industries,Co.
It starts with #11 in a job interview wearing a bag on his head, insisting that if he takes it off they will judge him based on his appearance. They assure him they would never reject him based on his face. He removes the bag and they quickly recognise him as Otter 11. Tehy state that he was recently found guilty and his resume in nonsense. #11 says they judged him on his appearance but they quickly say he infamous for multiple assault charges. This reveals that #11 was sentenced to 2 years imprisonment and 3 years parole as a result of as he describes it "trying to make the world a better place" but they state "Evin evildoers don't deserve to have their skulls cracked open with rocks!" and that they can't have somebody like that employed.11 asks that they are going to reject him without asking why an Otter would apply at Japans biggest marine corporation. They ask that an Otter man must know about Marine Products but he says he hates them and prefers a well done steak and the imported sea food that your company uses is even worse. The boss gets offended and and shouts "Not only are you a criminal who hates seafood, but you've insulted our company as well! Why did you come here?"Another employee reveals the bosses name Yoshida and #11 says that there are too many Yoshida's in Japan and they always reject him.
They bring up a petition about freeing Otter 11 when he was arrested and he has made the news alot. #11 says the media says that otters represent justice and there is even an "Otter Messiah" legend on the net. He reveals that he has over 5 million fans even though jumps circulation is 3 million. They decide to use that popularity to their advantage and hire him for advertisements. 11 stars in numerous misleading commercials about products and rose to the rank he is today. Yoshida hands him a script for a new misleading commercial and that they don't get complaints anymore about the products because they see the commercials as jokes and look forward to #11's new commercials and states that that is the only reason he got promoted. #11 thinks to himself that Yoshida hold nothing but contempt for him and his job.11 gets mad and leaves early, when he gets home he turns his fists to different types of rocks and declares that he wants to hit somebody with his fists. He says in the past that he bludgeoned evildoers because he wanted to hit somebody and not for justice.
He says that otters mercilellsly smash clams and he has their blood in him but as a human he isn't satisfied with clams, who have done nothing wrong and wants to hit evildoers, seeing those evil human faces writhing in agony, He wants to hit them and even though his otter blood allows that, his human blood doesn't.
11 struggles with himself and if he hits somebody he will get arrested and lose his social standing and is also worried about Hamada-kun, an otter with the face of a man and what will happen to him. He thinks that should he abandon his status and hamada-kun and turn to evil. He decides against it but says while he has control he has to do something.
He goes to a surgeon and threatens him to cut of his rock hands or he will hit him with them. He wakes up after the surgery tied to a crucifix with his hands in tact and two men in suits who say they aren't government agent and want to use #11 as a weapon. He thinks to himself and wonders if this is an Otter Mans life.
Otters 11 has been made into an Anime with a midnight time slot.
- Otters 11 came 4th in the first Manga Popularity Poll with 836 votes.
- Otters 11 has its own line of action figures.
- Otter 11's employee Yoshida is Kazuya's editor Yoshida.
- One of the fan letters to let Otter 11 out of prison said "Capture Otter 11 and don't let him rest; If you're going to let anyone rest, let it be the Mangaka Hiramaru Kazuya"
- The chapters are called "Shells."
- Otters 11 had a 15 page story in the real life 35th Issue of Weekly Shonen Jump in 2010. 
Death Note Reference
The truck scene where #11 crashes the truck into the building is a reference to a Death Note scene where Soichiro Yagami crashes the truck through Sakura TV.
The media called Otter 11 a "modern day Kira", Kira was Light Yagami's alias and what the media called the person who punished evildoers by giving them heart attacks.