Years after retiring from their formidable ninja lives, a dysfunctional family must return to shadowy missions to counteract a string of looming threats.

In the meeting room, members of the Special Investigation Unit and Ministry of Education desperately trying to find a replacement for the hiragana "Nu", a character being used as a symbol by the extremist terrorist organisation.

Years after retiring from their formidable ninja lives, a dysfunctional family must return to shadowy missions to counteract a string of looming threats.