why would someone...unless they are cucks.
Dont get why this trash is tagged as Harem since every single scene, except the very first in beginning, is voyeurism where MC watches other having sex. So the description "Maho needs to to bring this other world's people to the Magic Mirror van and have sex with them. With a large-breasted princess and perverted nun as his companions, his sexual journey begins." is a blant lie and I cant understand how Mangakas thing they can get away with it.
The "plot" is dumb as someone can expect from reading the title alone. Its more smut, hentai then manga but sadly with the typical japanse cuck mentality of a writter here.