S01E01 Wonderful Days
Keita Suminoe has a problem with his twin step-sisters, Ako and Riko, being overly romantic towards him. However, he wants to attend the same high school as them, so is uncertain on what to do...
KissXSis
S01E05: I'm Sorry!
While talking to his friends, Keita accidentally gropes his fellow student, Miharu Mikuni, and gets slapped. Ako and Riko become suspicious about whether Keita has been 'cheating'. When Keita goes to study at the library, Miharu, who is the librarian, becomes too intimidated by Keita to go to the bathroom. Before she can go to one, Keita tries to return a book she dropped and chases after her, dragging her into various hiding spots to hide from Ako and Riko. However, they end up getting locked in the gym storage room and their hashed escape plan leads Miharu to relieve herself on Keita's back. They eventually manage to escape and Keita promises to keep Miharu's incident a secret, though gets beaten up when he accidentally sees where Miharu had removed her panties from.
Overview
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.
Episodes
S01E02 A Lesson for Two
Ako decides to help Keita study in order to improve his passing rate, though both have a little trouble staying focused on the matter at hand. Ako shows Keita her chest in order to encourage...
S01E03 Alluring Sweets
Keita gets annoyed with being kissed by Ako and Riko him all the time and instigates a ban on kissing. Overhearing that Keita likes sweet things, Riko tries to make him some chocolate, but can...
S01E04 Qualifications of a Lover
While Keita studies at school, Ako and Riko reminisce on when they started going to junior high, the first time they were apart from Keita. When they watched Keita perform athletics, they fell in love...
S01E05 I'm Sorry!
While talking to his friends, Keita accidentally gropes his fellow student, Miharu Mikuni, and gets slapped. Ako and Riko become suspicious about whether Keita has been 'cheating'. When Keita goes to study at the library,...
S01E06 Uneasiness at Akihabara
Unable to view and get porn from the internet using a PC their father won at a raffle, Ako and Riko decides to buy erotic games in Akihabara. But in the process Keita has to...
S01E07 Wh-What!? A Dripping Wet Midsummer Delusion
One of Keita's friends coaxes him into going to the pool with him and Mikazuki and inviting Ako and Riko. Suspicious of what they might be up to, Yūzuki decides to tail them. Whilst trying...
S01E08 It's Always That in August
The summer festival comes, and it will be the only day Keita will be free from all the prep school work. This means that Ako and Riko will be competing for a night at the...
S01E09 Turning to God Only in Times of Suffering
As Keita tries to study, Ako and Riko compete with each other to be the most helpful. Whilst alone in the room, Riko and Keita end up doing some 'footplay' under the kotatsu until Ako...
S01E10 At Last, the Real Thing!
With Keita ill before the big exams Ako and Riko step up to the mark by getting out of school and making Keita feel better by nursing him back to health, but a slow recovery...
S01E11 Nitpicking a Good Day!
Keita eagerly awaits the results of his exams, with Ako and Riko trying to give him good luck, though encounter several unlucky omens along the way. When they get to the notice boards, Keita's number...
S01E12 One, Two, Threesome!
After Keita's graduation, Ako and Riko arrive to find they were too late to get the second, or any button, off of Keita's blazer. They decide to, against Keita's will, hold a draw for consolation...
Cast
Yuiko Tatsumi
Riko Suminoe (voice)
Ayana Taketatsu
Ako Suminoe (voice)
Ken Takeuchi
Keita Suminoe (voice)
Tomoyuki Shimura
father (voice)
Tomoe Hanba
mother (voice)
Kiyotaka Furushima
Toda (voice)
Asuka Ohgame
Mikazuki Kiryu (voice)
Asami Imai
Yuzuki Kiryu (voice)
Yoriko Nagata
Miharu Mikuni (voice)
