When you've learned a little about Sadako Sasaki here at Activity Village, and perhaps done some of your own research, you could use this story paper to write about her in your own words.
Sadako Sasaki Story Paper
Kids can colour in the cute picture and write about what they see or about Kokeshi dolls or other Japanese customs. Alternatively, use this lovely paper for letter writing etc.
Here's a fun way to write about the tradition of flying carp kites in Japan for Children's Day. Colour the picture in, and write on the right.