Mother's Daughters

(from ebookjapan):
Maiko is blessed with her own parents, a loving husband, and two children, and she is supposed to be leading a happy life with her family of six. But one day, she suddenly hears a voice in her head. "Every day is a little unfulfilling...". She soon realizes that she is talking to herself, but what is she unhappy about when she thought she was happy...? When she talks to her husband about this, he says it is because she needs someone to talk to, and encourages her to see a friend for the first time in a while. Maiko then decides to meet Kyoko Hayashi, a friend from junior high school...?