kindleは1巻だけ
http://www.amazon.co.jp/dp/B018FY6FK6
ebjは3巻まで無料
http://www.ebookjapan.jp/ebj/title/164904.html?volume=1&branch_no=0
http://www.ebookjapan.jp/ebj/title/164904.html?volume=2&branch_no=0
http://www.ebookjapan.jp/ebj/title/164904.html?volume=3&branch_no=0