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I think it is mentioned somewhere that witch is able to live a very long life. So, it is possible for Godou's harem to accompany him for quite some time (except maybe Yuri Mariya), or he can use the power of Youth to artificially lengthen the life of his harem ^^.
There is also another possibility that Godou will lose his Campione power at the end of the series and become normal high school boy who lives with his harem. It is not unheard of to have the protagonist lose his power at the end of stories, and if pulled well, will give the ending more depth.
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