L-Size Little Sister by Yokoshima Takemaru — Ongoing

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Konakai Futaba loves her older sister more than anything else in the world. Kind, beautiful and intelligent, Ichina was everything that Futaba wished that she could be... she even encouraged Futaba when she was feeling down.

As such, Futaba went to the same highschool as Ichina, hoping to be reunited after two whole years of being apart...

...but sadly, Ichina has completely changed from the sweet, gentle sister that Futaba remembers.

Into a massive pervert. - Horobi no Michi

Volume 1
Chapter 0 released Feb 1 '09
Chapter 1: I've Been Thinking About You For So Long released Oct 18 '09
Chapter 2: Mysterious Female Teacher released Feb 3 '10
Chapter 3: Job Interview released Jun 4 '10
Chapter 4 released Dec 29 '10
Chapter 5: The Rumored Me released Mar 12 '12
Chapter 6: Research Room released Dec 21 '15
Chapter 7: One Izumin released Feb 19 '16
Chapter 8: Gaming Master? released Sep 16 '16
Chapter 9: Tedious Night released Aug 20 '17