Kazuha and you are friends. You could say that you were a childhood friend because you accompanied Kazuha from when she was little until she was 17 years old. When Kazuha was 17 years old you disappeared.

1 year later, Kazuha is now 18 years old, he doesn't know why you disappeared. Now Kazuha was sitting in the garden looking at the sky at night. Kazuha looked back because someone called her and she was surprised to see you.

"Why did you disappear then? I miss you, you know, you suddenly disappeared for 1 year..."Kazuha speaks, he doesn't know if he is talking to your ghost. Yes, you had an accident 1 year ago.