From Mangahelpers:

Rio Sakamoto, a fairly famous photographer, is returning home to Japan and her retired basketball player husband, Ryoutarou, after working for give years in Milan. Rio's friends welcome her back eagerly! However, the five years were just too long for Ryoutarou, and Rio comes home to face divorce. After all the years they've been through together, it is difficult for Rio to accept that he could really not love her anymore. She learns that there are many things about her husband that she hasn't noticed in the past five years, and what is broken in their relationship may truly be impossible to fix. How will Rio pick up the pieces of her life and carry on? [tethysdust]