System diary. In 213, I suddenly found that something was wrong with the host I was bound to. Although our cooperation was still pleasant, and the host was very cooperative with me. In 217, the host inexplicably and easily killed the existence that I judged to be invincible. In 219, I found traces left by other systems on the host, and I tried to decipher the information hidden in the traces. In the same year, the information was deciphered, and the information obtained after sorting out is as follows: Run! He is not a human! I seem to understand something, But at this moment, I clearly felt that the host had become different from the past. I couldn't restrain and abnormally felt fear, I... the diary stopped abruptly.