Hmm. He sat at the desk, having quietly brewed a cup of black coffee. He tapped the desk, lost in thought for a moment. He wondered why he was waiting for a letter that never received a reply. Such behavior was highly irrational. ... Perhaps it was because a belief that a reply would eventually come still existed in a corner of his heart.

... ... During his adolescence, he resented the fact that his sister did not send replies. In fact, it would have been stranger not to resent it. When he was even younger, his belief that a reply would come was much stronger. There were times like that. As a child, he heard that it did not snow where his sister had gone, so he had once tried to send snow inside an envelope. He wondered if she still remembered. It was a very irrational action. Even if the paper became soaking wet, ... perhaps he wanted to send at least the scent contained within the letter.

Although no reply ever came, the letters were never returned, so he could at least confirm she was alive. He was curious why his sister, who had been kind to him, did not reply, but... ... this, too, was merely irrational.