>>5177562The invaders come as a set of nine - you can't have one without the others. They're not just your waifu, but also your best friend and your family. There's no harem nonsense here - they care for each other as family too, and the whole group cheers whenever one of them gets closer to you.
Will cook with you, play videogames or build plamo with you, and engage in teasing contests with you. Both clumsy and elegant. Both a smart big sister and a giddy little sister. Wants to be protected, but is also super-strong and will teach you enough combat skills that you can fight bad guys side-by-side. Also super rich, has a spaceship which is also a giant robot, and is a Newtype who can unlock your psychic powers.
They're unknowingly aspects of a goddess who's such a giga-waifu that she can't manifest into the physical world without dividing her traits between multiple vessels. She watched the universe die and be reborn, trillions of times, until finally there was a reality where her beloved came to live with all of her aspects at once. 