A possessed Ninja doll teams up with a teenage boy to avenge the murder of a poor child factory worker.

Aske is an average boy in seventh grade who just wants a peaceful life without being bothered by obstacles he faces daily. He has a crush on a girl named Jessica, who is one grade above him. His nerdy best friend is Oddyseus, and is being bullied by a boy who attends a special ed class named Glenn. Aske has a strained relationship with his stepfather Jørn and stepbrother Sune. Aske's life turns upside down one day when he gets a ninja doll as a gift for his 13th birthday by Uncle Stewart, who was on a vacation in Thailand earlier. He soon finds out that the ninja doll was possessed by a spirit belonging to a Japanese samurai named Taiko Nakamura who committed ritual suicide (seppuku) to save humanity from evil. The doll teams up with Aske to avenge the death of a Danish businessman named Phillip Eberfrø, who beat a poor boy to death in a sweatshop in Thailand. This puts Aske and his new friendship with this doll to the test, getting themselves ready for an adventure Aske never has been in before.—BlackRose02

When young Aske gets a ninja doll dressed in check clothing from his Uncle Stewart after a trip to Thailand, he finds out that the doll is alive and can help him with problems at school. Aske wants to return the favour, but soon Aske learns that the 'checkered ninja' is possessed and on a mission to avenge the murder of a poor child factory worker in Thailand.