This is a manga that imagines a world where the sex of humans works a bit like clownfish: everyone is born male, but a minority of larger individuals become female. It's a form of gender science fiction. It was originally a one-shot in 2021, then there was another chapter late last year, and now it's getting a series, although apparently planned as a short one. The creator is Mikuriya Minoru.
Posting about some of the manga I read. I read manga in Japanese.