The fourth book in the “Imouto Series”. 1. Imouto Futari (義妹二人); Comic Penguin Club 2013-11 2. Imouto Gisou Koibito (義妹偽装恋人); Comic Penguin Club 2013-12 3. Imouto Hanayome Shuugyouchuu (義妹花嫁修業中); Comic Penguin Club 2014-01 4. Imouto Date Quest (義妹デートクエスト); Comic Penguin Club 2014-04 5. Imouto Hanjuku Kaika (義妹半熟開花); Comic Penguin Club 2014-06 6. Imouto “AN” Plugged (義妹［ＡＮ］プラグド); Comic Penguin Club 2014-08 7. Imouto Conception (義妹コンセプション); Comic Penguin Club 2014-10 8. Imouto wo Oboezu (義妹暁を覚えず); Comic Penguin Club 2014-05 9. Imouto on the Beach (義妹オンザビーチ); Comic Penguin Club 2014-09 10. Imouto in Closet (義妹ｉｎクローゼット); Comic Penguin Club 2014-07 11. Imouto Kazoku Keikaku (義妹家族計画); Comic Penguin Club 2014-03 12. Imouto Saishuubi (義妹最終日); Comic Penguin Club 2014-02