A quest for Aladdin's magic lamp turns into quite a challenge for Lupin when, after a strange encounter with the Djinn of the lamp, he loses his memory of his last twelve hours. Even worse, he is now cursed with the inability to remember anything that happens to him between 7 p.m. and 7 a.m. With a woman he can't remember at his side, a wildly jealous Fujiko as his opponent and no recollection of what went wrong, how will he regain his sweet lost nights?

Source: AnimeAcademy's summary by Taleweaver

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Parent story: Lupin Sansei: Part III