Sayonara kazoku

A year ago,Yohei saw his father's sudden death with his own eyes. Yohei, who still can't get over his loss, visits his parent's home for the first ceremony of his father's death. Mother is struggling to accept father's death in her own way. Yohei, can't understand her trying to move on. Then, he starts to see unnatural experience. How do we shoulder and get over the death of someone precious? A story where a family keeps looking for a half part of themselves lost after the death of their loved one.