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If you enjoy the "assertive younger sister" or "complicated family dynamic" tropes, you might enjoy:

: A more mainstream take on polyamorous relationships with similar "straightforward idiot" protagonists. My First Girlfriend is a Gal doujindesutvkanojonoimoutowanikushokuk exclusive

But there’s no widely known series by that exact name. This seems like either a typo or a niche doujin title. If you enjoy the "assertive younger sister" or