Yoko finds Hiromu with a Christmas music box before he goes to sleep .
Yoko learns from Usada that the music box is Hiromu 's last present from his parents before the accident 13 years ago .
Finding Hiromu with a Christmas music box before he goes to sleep , Yoko learns from Usada that the music box is Hiromu 's last present from his parents before the accident 13 years ago .