Keita has two older step-sisters, Ako and Riko, but since they aren’t related by blood, they love him in a lustful way. After a mishap at school, Ako and Riko finally confess their love to him. Keita dislikes the thought of seeing them other then brother and sister, but as he tries to enter the same school as his sisters, he slowly becomes attracted to them.
Kiss x Sis is a Japanese seinen manga written and illustrated by Bow Ditama (Author and Illustrator of Mahoromatic and Fight Ippatsu! Juuden-Chan!!). It began serialization in Bessatsu Young Magazine on December 11, 2005 and has since been published into fifteen volumes. The anime adaptation consists of two series: a twelve-episode anime television series and a twelve-part OVA series. The first OVA was released on December 22, 2008, with subsequent episodes released with volumes of the manga until April 6, 2015. The anime television series aired between April 5, 2010 and June 21, 2010.
First off yes this compilation includes all of the Kiss x Sis TV episodes and the OVA’s in one video they were organized by release order: OVA’s 0-2 → TV Episodes 1-9 → OVA 3 → TV Episodes 10-12 → OVA’s 4-11