Rika Kuroki, 28 years old, single. She is lonely being alone, but she can't "love" anyone - she can't "love" anyone. Rika has given up on the idea of falling in love with someone and getting married. However, when her roommate leaves her, she becomes fearful of growing old alone, and decides to adopt a shelter cat. However, when she goes to a shelter cat transfer meeting, she is told that she cannot give the cat to a single person. Two people and two cats are tired of being alone. Their slightly unusual cohabitation begins.