Responses
In the manga it explained that Hikari is "intersex" meaning he has both male and female reproductive organs. For example, he can have a penis but instead of testicles, he would have ovaries. In the manga they use the term "hermaphrodite" which some still use while others say it's a derogatory term. I hope this was helpful!
As for Akari, he must have a good chiropractor
I forgot to say that they assign gender based on visible/outward genitals.
hikari is a guy or woman. I dont understand bruh and akari spine back is good?