There are all kinds of cucumbers (thin or bent) but you can transform them all into easy instant pickles using just sugar and salt.
The pickled cucumber that a mother of one of my child's schoolmates brings to potlucks was delicious, I asked her for the recipe. This is a modified version of hers.
Even if the cucumber softens, they are tastier after 3 to 4 days.
Enjoy Japanese food around the world.