A psychic who claims to have contacted the lonely spirit of Princess Diana has released full details of their claimed "interview" 20 years after her death.

"Renowned spiritual leader" Ryuho Okawa claims he spoke to Diana's spirit earlier this month while in a Japanese lecture hall.

The man who founded the Happy Science movement penned the bizarre "interview" with Diana in a book entitled Spiritual Interview with Princess Diana which is being sold on Amazon.

According to Okawa Diana spoke about Kate Middleton, "telling" the psychic: "Catherine is very kind to me. I feel like that."

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But the biggest alleged revelations was when Okawa asked about Diana's death, the future of the royal family and her relationship with Prince Charles.

Asked if she could forgive her husband, Diana's spirit reportedly told Okawa: "No, definitely no. No, no, no. I don't hate him, but I believe that he's a devil.

"I'm wondering about the origin of beauty. If it comes from the beauty of the mind, the beauty of the heart, it's correct. But if it is just to attract the minds of men, it is not the real beauty.

"Like my former husband. Firstly, he loved me, but after marriage, he didn't have true love because it meant my beauty was just his accessory.

"So, he just wanted to show me as a beautiful lady and wanted to be proud of the fact that a prince can get the world beauty."

Ryuho Okawa claims to have contacted the princess in the afterlife. Photo / Wongstar7/ Youtube
Ryuho Okawa claims to have contacted the princess in the afterlife. Photo / Wongstar7/ Youtube

Diana's spirit supposedly told the psychic she believes the dynasty of the British Royal family could soon be over with fears the country faces a new revolution.

She was asked if she hopes her child, Prince William, would become king of the UK, to which Diana responded: "I'm afraid that England will experience another revolution. So, I cannot imagine that the royal family will continue forever.

"My tragedy, it's a turning point, I think so. There's no truth. There's no love. There's no loyalty. There's no obligation to subjects, so I feel a little different. That's the reason I prefer Islam."

Okawa's book has been released for the 20th anniversary of Diana's death. Photo / Amazon
Okawa's book has been released for the 20th anniversary of Diana's death. Photo / Amazon

Diana's spirit allegedly weighed in on her death, with the interview taking a dark turn when she was asked if she was killed by someone.

"I'm not sure, but I felt some kind of evil intention," she is quoted as saying.

"Maybe secret service or... Someone was aiming to deprive me of my life after I got a divorce. It's from Charles or..."

"He can send some messenger of death."

Okawa has reportedly sold more than 100 million books worldwide on various topics.

In 1986 he founded Happy Science, a spiritual movement dedicated to "bringing greater happiness to humankind", which has more than 12 million members.