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The first reason was the little sister. Haru wasn't sure why, but most authors loved to write the main character to have a little sister.

The second reason was that the fourth primogenitor was a girl, and she was the one who gave Kojou an ability, which very fit the description of the harem protagonist.

It might sound rude, but almost all the harem protagonist light novels were quite similar to each other, so it was quite easy to find it, especially when Haru saw Kojou's ...

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