The set I have, which was given to me, is called 実用ボールペン字講座, which is kind of just a generic thing. Like a box of cereal that says “Cereal” on it.
I don’t know where that specific one would be on sale, but if you search for that, lots of products in the same category will come up.
I gave 志 another whirl today. I watched some more videos on proper technique.
Yesterday’s is on the right.
