I bought secondhand comic books. There is a secondhand book store named Bookoff near my house. Unfortunately they did not have what I wanted. I purchased the whole story through the Internet. The entire story consists of 21 books. The original price of whole 21 books is 11,550 yen ($115.50 €88.85). I paid 6,295 yen ($62.95 €48.42) for 21 books. It is 54% of the original price. I got them several weeks ago, but I have not read any of them yet.