"Jouzu na kansou-bun no kaki-kata,"
https://www.msu.edu/course/asn/491/It's written for advanced level college students, but Japanese college students might benefit, too.
For high school students, you'd probably have to modify a bit. [M. Endo]
Bibliography Thomas McAuley, 2010. Why Can't Japanese Writers Stick to the Point?
http://www.wreac.org/japanportal/thoughts-on-japan/367-why-cant-japanese-writers-stick-to-the-pointThomas McAuley, 2010. Japanese Writers Do Stick to the Point!
http://www.wreac.org/japanportal/thoughts-on-japan/368-japanese-writers-do-stick-to-the-pointThomas McAuley, 2010. How Japanese Writers Make the Point
http://www.wreac.org/japanportal/thoughts-on-japan/369-how-japanese-writers-make-the-pointauthor's blog,
http://www.wreac.org/japanportal/thoughts-on-japanAdditional materialAkiko Takagi, 2001. The Need for Change in English Writing Instruction in Japan
http://www.jalt-publications.org/tlt/articles/2001/07/takagiBern Mulvey, 1997. Japanese and English Rhetorical Strategies: A Contrastive Analysis
http://www2.aasa.ac.jp/~dcdycus/LAC97/rhetoric.htmTad Matsunaga, 1999. Contrastive Rhetoric and Japanese English Students' Expository Writing Style. ERIC, (ED436102)
http://www.eric.ed.gov/ERICWebPortal/recordDetail?accno=ED436102