My people will be gone in three months.

I had 100 friends before I came to your home.
Two months ago, I came to your home.

We were 100 people who were more like twins, all very similar and black. We lived in a very small place, and we were chosen to come to your home, and 100 of us came together. It was the first time in a long time that I breathed fresh air, and it tasted so good and made me feel so free.
You usually choose two or four of us to go out with you.
But there is a problem. I feel like I don't see the people I used to go out with anymore. 100 of us used to go out together, but in one month, there are only about 50 of us left.
Where have they all gone? And in the second month, there are only 20 people left. I can't go out yet, so I just watch them go out. I talked with Satoshi, who couldn't go out recently. He said, "It would be better if they don't pick me. Because everyone who went out didn't come back. And you take two new people with you the next day, don't you? I was getting scared of what was going on. When I came to, Satoshi was gone too. I had no one left to talk to, and I wanted to protest, but since I was the one who originally brought them here, I couldn't say anything.

Three months later. I finally realized that it was just me and Mami. I thought to myself, "What should I do," but then I looked next door and there were 100 people lined up just like us again. I don't know what's going on, but they seem to be a little younger than the ones we were with, and they seem to enjoy being among other people, so they get excited at night.
Three months later, I looked next door and saw that there were only two of them. I thought it was strange.
I think our friends can be found in 100-yen stores. I think some of them have round or brown heads....

Eh? Is that our name? Some of our friends are from different countries, but they are called hairpins. There are also others called American Pins, U-Pins, and so on. But when we go to someone's house, we all seem to disappear after about two months, and no matter where we look in the house, we can't find any of our friends. I am sure there must be our friends somewhere in Japan.... It's strange. Hmmm...