Second volume in the “Imouto Series”.

1. Imouto no Giri Giri (義妹のギリギリ　夏); Comic Penguin Club 2011-09
2-3, 12. Imouto Lesson (義妹レッスン); Comic Penguin Club 2011-05, 06, 2012-03
4. Imouto to Mitsugetsu no Owari (義妹と蜜月の終わり); Comic Penguin Club 2011-11
5-7. Imouto Kaizouron (義妹改造論); Comic Penguin Club...