There are some things to take into consideration with that. Generally, the people who would do this, are very hardcore about their anime. They are the European football fans of anime to put it in perspective. The games they tend to marry girls from are dating sims, which tend to focus on winning over the girl of your choice. NEETs and Hikikomori (No current employment, education, or training, and the 2nd is a phenomenon where an individual will not leave their house upwards of 6 months.) are even more susceptible to this because their lines of reality become blurred if they are spending too much time in the virtual world. They estimate that hikikomori make up 1% of Japan’s population, and 20% of all adolescent Japanese men. When you think of it that way it’s not so surprising that something like that could happen. I do find it kind of weird, but I’ve seen much weirder things.

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Thank you for your interest =D