Tada Ookina Neko ni Naritai

The manga centers on Rika Kuroki, a 28-year-old single woman, who already gave up on falling in love and getting married. But when Rika's housemate leaves her to get married, she becomes afraid of growing old alone and decides to adopt a rescue cat. However, at the cat adoption event, Rika was told that a single person cannot adopt a cat. But she finds another person to help her adopt a cat. (Source: ANN)