義理なら兄妹恋愛してもいいよね

The fifth book in the “Imouto Series” 1. Imouto Princess (義妹プリンセス); Comic Penguin Club 2015-06 2. Imouto Practice(義妹プラクティス); Comic Penguin Club 2015-07 3. Imouto Station (義妹ステーション); Comic Penguin Club 2015-09 4. Imouto: Kiseki no Shunkan (義妹－奇跡の瞬間－); Comic Penguin Club 2014-12 5. Imouto: Mienai Kigae (義妹－見えない着替え－); Comic Penguin Club 2015-03 6. Imouto Kekkon Zenya (義妹結婚前夜); Comic Penguin Club 2015-05 7. Imouto to Gimai (義妹と偽妹); Comic Penguin Club 2015-04 8. Imouto to Saddle (義妹とサドル); Comic Penguin Club 2015-08 9. Imouto Detox (義妹デトックス); Comic Penguin Club 2015-02 10. Imouto Saimin Anji (義妹催眠暗示); Comic Penguin Club 2015-01