Shiori is turning 35, married for 9 years and trying to adapt to the unvarying and boring routine as a wife. She thought that this tranquillity will be their future as a married couple but one she stumbles on a diary on her husband's study. As Shiori reads through the pages, she realizes it is her husband's diary where he put down in writing all his private moments with his lover! Is it time for Shiori to start her own diary?