The elder brother of a Nepalese man granted a retrial in Japan after serving 15 years in prison for the 1997 murder of a Japanese woman expects his sibling's rehabilitation to be a challenge.

Indra Mainali, 54, who is waiting for Govinda Prasad Mainali's return to Nepal, said while the Tokyo High Court's decision on Thursday to grant a retrial has ended a chapter in Govinda's suffering, another chapter of less tangible suffering is about to begin.

Govinda's daughters felt during conversations with their father last week that 15 years of imprisonment have inflicted heavy psychological and emotional damage on their father, Indra said.