Title: Koi-iji: Love Glutton
Original Title: こいいじ (Koiiji)
Author: Shimura Takako
Status in Japan: 5 volumes, ongoing
Scanlator: Megchan's Scanlations feat. Migeru
Scanlation Status: Ongoing
More Info: Baka Updates
Summary: 31-year-old Mame has been in love with her childhood friend Souta ever since she can remember. Despite multiple rejections, her love has stayed constant. It's become a habit more than anything, but is it one she'll ever be able to break and get on with her life?
Chapter Summary: Mame finally confronts Sou-chan about his past with her sister.
Chapter 15: A Woman Is a Woman
And here's a full volume download for those who want it.