The definitive Harem anime that spawned a boatload of tropes! And best of all--the fanservice is relatively minimal!
This bizarre but thoroughly fun Science Fantasy rom-com is sadly not widely known by a lot of young folks nowadays. It's definitely not for the kids since there is some nudity, though it feels far more natural and less gratuitous than the cringe-worthy breast physics present in today's trope-filled torrent of junk we need to sift through nowadays, plus some dialogue can get EXTREMELY suggestive. ("I need a sperm sample! How should I get it?" Give the poor kid some privacy!) Every character, from what I can tell, is the root of every tsundere, kuudere, (soft) yandere, deredere, and "loli." Plus there's a heccin' cute space puppy-kitty that is also a spaceship and can morph into a surprisingly cute girl. Both the smol and huggable kind and and curvy kind. Yeah, I don't get it either.
It's kind of hard to explain this show without revealing any major plot points or ruining the great worldbuilding. Give it a watch if you're old enough to not giggle at the sight of breasts for a laid-back and (relatively) wholesome rom-com that will take you back to simpler times.