Season
- Season 1 2010-04-05
- Season 0 2008-12-22
Episode
- Episode 1: Wonderful Days
- Episode 2: A Lesson for Two
- Episode 3: Alluring Sweets
- Episode 4: Qualifications of a Lover
- Episode 5: I'm Sorry!
- Episode 6: Uneasiness at Akihabara
- Episode 7: Wh-What!? A Dripping Wet Midsummer Delusion
- Episode 8: It's Always That in August
- Episode 9: Turning to God Only in Times of Suffering
- Episode 10: At Last, the Real Thing!
- Episode 11: Nitpicking a Good Day!
- Episode 12: One, Two, Threesome!
KissXSis Season 1 Wonderful Days
The story begins with Keita Suminoe, a male third-year junior-high school student studying for his high school entrance exams. He is living in a home with his older twin stepsisters, Ako and Riko, who share no blood relation to him, and they help him prepare for his exams. Even though he initially dislikes himself for it, he begins to become attracted to his two step-sisters, and his two parents encourage him to eventually get married to one of them.
