Parallel Paradise is a Manga in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on ww.parallelparadisemangafree.com fastest updating comic site. The Summary is

A normal day at school takes a strange turn for Tada Youta when a bizarre apparition shoves him out a third floor window. He awakens in a fantasy realm unlike any other. Not only do dragons and knights exist, but every single inhabitant of this world is a voluptuous babe! No men have been seen in the kingdom for thousands of years, so Youta is about to get very, very lucky. Whether Youta has actually died or been transported to this place for mysterious, unknown reasons… either way, it’s his version of Paradise!