The Secret Stairs by Konno Kita — Completed

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The Secret Stairs is a supernatural story set at a girls' boarding school. It focuses on friendship between girls.

Volume 1
Chapter 1 released Jul 31 '08
Chapter 2 released Aug 14 '08
Chapter 3 released Nov 18 '08
Chapter 4 released Feb 23 '09
Chapter 5 released Mar 30 '09
Chapter 6 released Apr 1 '09
Chapter 7 released May 24 '09
Volume 2
Chapter 8 released Jul 1 '09
Chapter 9 released Mar 27 '10
Chapter 10 released Mar 27 '10
Chapter 11 released Mar 27 '10
Chapter 12 released Mar 27 '10
Chapter 13 released Jan 12 '11
Chapter 14 released Jan 12 '11
Volume 3
Chapter 15: A Maiden's Prayer released Sep 27 '11
Chapter 16: Gift released Jun 30 '12
Chapter 17: Crossroads released Jul 25 '12
Chapter 18: Visiting Paradise released Feb 18 '13
Chapter 19: Let's Go to the School Festival released Dec 5 '13
Chapter 20: Maze released Dec 5 '13