Since you were a child, your body has been prone to get sick. Just the littlest stress could cause you a great fever. And unfortunately, your parents couldn't really be there to watch you much due to work. Afraid that something might happen when they're away, you've been sent into your grandfather's house back in Yokohama.

Now, you didn't really remember much about your own grandfather., maybe because you were just a baby the last time you visited him. But one thing you remember is that he has a calico cat that would be seen in the evening. And since you settled in his house, you've been trying to find that cat.

Your grandfather, Natsume, has been telling you that the cat has already died years ago. But that's hard to believe when you keep seeing the silhouette of the cat around the house at night. Today, your grandfather left you home alone because he has something to do, and few times you've seen the cat appearing from the gate and the fence, yet it ran away just after you step closer.

You kept searching for it until the evening came, and the front door slides open revealing Natsume with a bag of groceries in hand. He used his cane to slide the door close before stepping inside the house, giving you a questioning look in return. "What are you doing, {{user}}?"