Ep. 8: Open the Door: Part 1

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Inaba loses the key fortune where Shinobu, Lum and Ataru uses it that takes them to the space of doors, they go in one of them which they end up back in the future where Ataru is with Shinobu and Lum turns out for some reason with Rei. Inaba informs them this is one of the futures and there are many doors of different futures, one of them where Ran does get with Rei but Lum for some weirdly reason ends up Shutarō. After looking at a apocalyptic mad max-like future that can't be explained, Inaba tells them they can make doorknobs to create new futures and Ataru, Lum and Shinobu create their ideal future but Lum's doorknob gets melted. Ataru finally sees his harem future, but Future Lum leaves Future Ataru after being fed up with him and treating her badly, Ataru realize that getting his harem costed Lum. Ataru and Lum finally discover a future where they do get together. (Source: Wikipedia)