An alien princess who was going to meet her fiance on the Earth, but taking the fireworks launched by Mutsumi as a signal, she landed and met him instead. Kaguya can be selfish and even childish at times, but she never loses her light mood and feminine charm. Mucchan couldn't leave such a woman in need, so he agreed to be her guide on the planet. And it's not because of the fact that she has a blaster, tentacles, two cyber-maids and a demon-butler.