Bunka Matsuri

In this world, children are born without a specific gender, and, as they grow up, they decide for themselves whether they want to be male or female.

On a certain day, all the teens in the right age group get together at school to make the change into their chosen gender with the aid of their senpais.

And, naturally, sometimes you get a young person who can't make up their mind whether they want to be male or female…