On the hill that lies behind Étoile, the Western-style inn that you reside in, a UFO comes falling from the sky?! And from within it come the five planetary princes– Turns out you're somehow the reincarnation of Kaguya-hime, and you'll need to carry out an engagement ceremony. You're informed that if you don’t marry one of these planetary princes by the end of the next six months, the entire universe will perish...! Having learned such a shocking truth, the situation quickly accelerates! Due the appearance of both the princes and the sudden new bishounen transfer student, your once-peaceful daily life turns into a lively one. The stars, the moon, and the Earth’s forecasts intertwine as a grand love story begins now!