Binetsu Kuukan by Aoki Ume — Ongoing

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Akasegawa Naoya's mother remarried recently and he suddenly finds himself trying to get along with his new big sister Amane, a student of the prestigious Kasugano Girls' School. But his new big sister isn't like what you might first expect.

Chapter 1 released Jul 18 '14
Chapter 2 released Jul 18 '14
Chapter 3 released Dec 13 '14 Aaaaaangst Yuri crush
Chapter 4 released Mar 8 '15
Chapter 5 released Jul 26 '15
Chapter 6 released Dec 4 '15 Yuri crush
Chapter 7 released Mar 7 '16
Chapter 8 released Jul 26 '16
Chapter 9 released Nov 8 '16
Chapter 10 released Mar 21 '17
Chapter 10.5 released Jun 1 '17
Chapter 11 released Jul 25 '17
Chapter 11.5 released Sep 5 '17
Chapter 12 released Nov 29 '17
Chapter 12.5 released Jan 14 '18
Chapter 13 released May 9 '18
Chapter 14 released Aug 20 '18