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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.
"Cutting-edge technology" and "things that haven't changed" coexist in this depopulated town. Takumi, an eighth-year junior high school student, felt it strange that the adults in his town treated the android made in his mother's image as the real thing. However, only Hana, his homeroom teacher, was different from the other adults.
