''Imouto wa Shishunki'' (My Adolescent Sister) is a 4koma manga by Ujiie Tozen. It is about 18-year old OrdinaryHighSchoolStudent Shinji Jyoushima and his ''very'' perverted 16-year old sister, Kanami. Like many 4komas, it is a SliceOfLife comedy, dealing with the daily life of the siblings. It's humor is mostly of the sexual kind, mostly delivered by Kanami, who often has nothing else on her mind than sex (although she isn't the only one who seems like that).
!!This manga provides examples of:

* BigBrotherAttraction: Kanami, and she doesn't seem to make any attempt to hide it.
* {{Fanservice}}: Surprisingly sparse, considering that it mainly deals with sexual themes.
* GoldfishScoopingGame: While playing the game, Manaka gets quite a few fish and attributes it to her [[http://mangafox.me/manga/imouto_wa_shishunki/v04/c043/3.html scoop not breaking because she is still a virgin]].
* LovableSexManiac: Kanami. Arguably, also Kazuya Arai.
* ParlorGame: Kanami starts a [[http://mangafox.me/manga/imouto_wa_shishunki/v03/c028/6.html shiritori game with her kindergarten class]] and their teacher starts to say reezun (raisin) but then she realises that means she would lose and changes it mid-word to rezubian (lesbian). The other teacher is shocked but Kanami just cheerfully points out that she loses.
* PornStash: Shinji has one, but -- much to his chagrin -- Kanami likes to take magazines without asking.
* RunningGag: Kanami's classmate Kanou Miho, who has a crush on Shinji, attempts to get closer to him -- and is always foiled by Kanami.
* SliceOfLife
* TroublingUnchildlikeBehavior: Even as kindergartner, Kanami already had a dirty mind. Of course, it is PlayedForLaughs here.
* {{Yonkoma}}
* YoureDrinkingBreastMilk: [[http://www.batoto.net/read/_/164233/imouto-wa-shishunki_v1_ch12_by_furinkazan/5 implied source]] of the milk Komiyama-sensei digs up for the teacher's lounger.