This morning I tidied up the kitchen after breakfast, and I gathered some trash and went outside to throw it away in the trash box. At that moment, I suddenly noticed that I was holding a kitchen knife in my hand. I was wiping a wet knife just before I went outside. I guess that I forgot to put it back and unconsciously went out with it. Anyway, I thought that this sight—there was a woman with a knife in her hand near houses—was not good to be looked from neighbors, so I rushed to get back to my house.