Junta's great granddaughter goes back in time in order to ascertain that Junta stays the Mega-Playboy — to ensure her continued existence in the future. She is accompanied by an old man, who has his own nefarious reasons for wanting to keep Junta the Mega-Playboy forever.

Source: ANN

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Prequel: DNA2: Dokoka de Nakushita Aitsu no Aitsu