Question

what is a good topic to write about on medieval japan in only one paragraph?

Answer 1

Can you please elaborate a bit more on the question?

Answer 2

Haiku's look like they started around 1600's so maybe even a haiku about haikus?
But one paragraph about haikus would not be hard 5-7-5

It's 5-7-5
Anyone can remember that
or they will forget

Answer 3

im not sure if its the time period u want but they made fierworks and other cool stuff. You could talk about how they prayed 2 there dead family members....