From Seven Seas:
A normal day at school takes a strange turn for Tada Yota 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 Yota is about to get very, very lucky. Whether Yota has actually died or been transported to this place for mysterious, unknown reasons. Either way, it’s his version of Paradise.

Official English