Hikaru to Hikari by Takebayashi Getsu — Completed

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Chapter 1 released Dec 1 '12
Chapter 2 released Jan 6 '13
Chapter 3 released May 6 '13
Chapter 3.5 released Jun 19 '13
Chapter 4 released Sep 17 '13
Chapter 5 released Jan 14 '14
Chapter 6 released Mar 2 '14 Beach Swimsuits
Chapter 7 released Apr 18 '16