Welcome to White Rabbit Japan!
This book teaches you how to write Japanese in natural style like Japanese people usually write. In the real life most Japanese people write kanji in semi cursive style since that is faster than writing in square [printed] style. That's one of the reasons why your hand-writing does not look like the one written by Japanese people. Let's practice and make your Japanese writing flow !
Please note: This is an advanced-level book designed for native-level Japanese ability. If you are a beginner or intermediate student, you might want to try Ballpen-Ji no Renshu-Cho: Japanese Writing Practice Book
See also Fude-pen Renshu-Cho: Japanese Brush Writing Practice Book