How foolish I am! Today, I locked the door of my room without noticing my roomate's moment going out. He was angry at me and told me that I am crazy. But I don't know that he went out without key. I think that usual man would take it for granted that man can mistake in such situation and understand me. But he didn't. He is unsual man and I think that he has some kind of hysteris that only old student has. And he shows different reponse to me compared with other people. Also I have anger at him but I didn't express explcitly because I don't want to have anger in my calm mind.