The Otaku Katana is a melee Weapon that can be found in a variety of locations when scavenging. It is also sold at Trader Camps by the Blade Master, or by the Anime Salesman in bunches of 5.
The otaku katana can potentially attack up to 3 targets for twice the damage of a Baseball Bat. The quick cooldown makes it a good weapon for dispatching zombies.
The key weakness is the 5% break chance. This is higher than average for melee weapons and makes the katana potentially a liability if it's the only weapon the character has.
The Otaku Katana is not to be mistaken for the Strong Katana which has the same model but is significantly better.