In the near future a woman named Okamura Aya, or Aa-chan, has been working for two years and has begun living on her own for a job opportunity. With Aa-chan's mother working overseas as a doctor, Aa-chan's father Kouji is now living alone with the family's long-time pet cat Mii-san. One night, Aa-chan returns from a long day at work, and as she rests on her bed, she…