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A harem includes three or more characters who potentially show romantic interest in a male protagonist. The sex, gender, or orientation of the harem members is irrelevant as long as they exclusively, or at least primarily, are vying for the affections of the same individual - who may or may not reciprocate towards one, several, or none of these romantic rivals.

Isekai is a fantasy genre where a person from Earth is transported to, reborn, or trapped in a parallel universe or fantasy world. For beings from other worlds visiting Earth, see Reverse Isekai.

Unlike typical Isekai titles where a person from Earth is transported to, reborn, or trapped in a parallel universe or fantasy world, in these anime characters from another world find themselves on Earth through similar means.