Okaa-san to Issho!: 40-sai no Mitori to Koi

Erina is a 40-year-old single woman who has worked hard in both love and her career. One day, she receives a call from her mother with an unusual tone, only to learn that she has stage 4 colon cancer. Furthermore, she hears that her single friend from college, Tani, is getting married... (Source: Natalie, translated)