After a boy named Quang accidentally uses his scarf to create a checkered ninja doll, Eppermint brutally beats him to death.

As the Checkered Ninja ends up on a Danish cargo ship, he is picked up by Stewart Stardust, who gives the doll to his nephew Alex Stenstrom as a birthday present.

A ninja named Taiko Nakamura was given the mission of protecting the clan’s children whilst fleeing the province.

His soul left his body and killed the traitor and went on to become an avenging spirit that dedicates himself to protect children.

On the day of the fight, Alex wins, gaining him popularity and causing Jessica to invite him to her party.

Back in Denmark, Alex finds out that before departing, Ninja sent Jessica a voicemail, using his voice, apologizing to her and the two to become a couple.

That night, Alex sees on the news about street criminals and, inspired by Nakamura, becomes a vigilante, dedicated to protecting Albertslund.

Jordan Mintzner of The Hollywood Reporter gave the film a positive review, summarizing it as "Clever and a bit crude".

[6] Music for the film was composed by Christian Vinten, while six original songs were written and performed by Anders Matthesen and produced by Kewan Padré.

The English versions of the songs were sung by the Danish hip-hop singer Waqas Qadri ("Taiko Nakamura", "Pesto" and "Pushing That Snow") and songwriter Jimmy Antony ("Jessica" and "Alex’s Goodbye") according to the credits of the English dub version of the film.

Paul Tylak, who voices Stewart in the second movie (replacing Michael Glenn Murphy) provides the English vocals to "The Best in the World" ("Verdens bedste").