With a suggestive such as this one: One would expect a shallow echhi / harem style particularly as it involves a rather risqué subject. Not so much in this case.
The entire plot revolves around Kyosuke and Kirino, two siblings who got along really well in early childhood. But, for reasons that we later discover towards the series finale, they suddenly drifted apart and have been living in their parents house treating each other as complete strangers. Cut to Kyosuke being a young adult, getting ready for his entrance and such, in a weird situation he bumps into his sister and discovers that she's holding an adults- only PC game. Much to his surprise, he discovers that his little sister have been stockpilling adult-themed erotic pc games and various assorted little girl anime. Kyosuke sees an opportunity to help her sister out of that addiction, help her find new friends and fix their strained relationship. Of course, things start going down an interesting road as it becomes clear that Kirino herself holds bottled-up feelings towards her big brother that start to crack as the series progresses and their relationship improves. New friends, awkward situations, romantic rivalries and comedic hijinks follow suit.
Yet, despite the risqué subject and even the fact that the series goes off the rails and plunges into stupid town in the final episodes, it isn't plagued by lewdness, what little ecchi is there is played purely for comedy. More emphasis on romance, drama and feel good comedy. And to some extent it works. The writing in this series, however, isn't particularly strong there are a few things that don't work. Odd that a such young girl would be a magazine model and a track and field star at such a young age is a little weird and Kyosuke suddenly being a chick magnet is a little weird as well. Kirino's infatuation with her big brother is probably the best writing aspect of the show. You see, we learn from flashbacks that Kirino and Kyosuke were close when they were really young. She was frankly admired by her seemingly perfect big brother: smart, confident, he would do anything to help her. In her naive mind, he was the perfect little brother, but not just that in a way he was very much the perfect boy. As they grew older, she became dissatisfied by the changes she noticed in her brother and after a particularly nasty exchange of words with another childhood friend whom she blames was responsible for changing his brother, she drifts away from him. That's when she discovers and gets hooked into erotic little sister-themed PC games. Why? Well, because the main characters, the big brothers in those games are overprotective and seem closer to the big brother she idolized when she was younger. She found her happy place in those erotic little sister games. Of course, the series does beats you over the head with the problems of overindulging in otaku culture and how Kirino's brother complex can cause trouble for her and him. One episode in particular has a very amusing start when Mom and Dad confront the siblings over the alarming number of red flags between the two which result in Kyosuke living on his own for a short while so he can study for his mock exam and win their trust. Which I can say more but due to IMDb limitation I will end on this: the final episodes are arguably the dumbest thing ever. You could remove the incestual undertones and it would have worked perfectly as two siblings just working out their problems and fixing their broken friendship.
The entire plot revolves around Kyosuke and Kirino, two siblings who got along really well in early childhood. But, for reasons that we later discover towards the series finale, they suddenly drifted apart and have been living in their parents house treating each other as complete strangers. Cut to Kyosuke being a young adult, getting ready for his entrance and such, in a weird situation he bumps into his sister and discovers that she's holding an adults- only PC game. Much to his surprise, he discovers that his little sister have been stockpilling adult-themed erotic pc games and various assorted little girl anime. Kyosuke sees an opportunity to help her sister out of that addiction, help her find new friends and fix their strained relationship. Of course, things start going down an interesting road as it becomes clear that Kirino herself holds bottled-up feelings towards her big brother that start to crack as the series progresses and their relationship improves. New friends, awkward situations, romantic rivalries and comedic hijinks follow suit.
Yet, despite the risqué subject and even the fact that the series goes off the rails and plunges into stupid town in the final episodes, it isn't plagued by lewdness, what little ecchi is there is played purely for comedy. More emphasis on romance, drama and feel good comedy. And to some extent it works. The writing in this series, however, isn't particularly strong there are a few things that don't work. Odd that a such young girl would be a magazine model and a track and field star at such a young age is a little weird and Kyosuke suddenly being a chick magnet is a little weird as well. Kirino's infatuation with her big brother is probably the best writing aspect of the show. You see, we learn from flashbacks that Kirino and Kyosuke were close when they were really young. She was frankly admired by her seemingly perfect big brother: smart, confident, he would do anything to help her. In her naive mind, he was the perfect little brother, but not just that in a way he was very much the perfect boy. As they grew older, she became dissatisfied by the changes she noticed in her brother and after a particularly nasty exchange of words with another childhood friend whom she blames was responsible for changing his brother, she drifts away from him. That's when she discovers and gets hooked into erotic little sister-themed PC games. Why? Well, because the main characters, the big brothers in those games are overprotective and seem closer to the big brother she idolized when she was younger. She found her happy place in those erotic little sister games. Of course, the series does beats you over the head with the problems of overindulging in otaku culture and how Kirino's brother complex can cause trouble for her and him. One episode in particular has a very amusing start when Mom and Dad confront the siblings over the alarming number of red flags between the two which result in Kyosuke living on his own for a short while so he can study for his mock exam and win their trust. Which I can say more but due to IMDb limitation I will end on this: the final episodes are arguably the dumbest thing ever. You could remove the incestual undertones and it would have worked perfectly as two siblings just working out their problems and fixing their broken friendship.