http://www.wikihow.com/Buy-Film-Rights-to-a-Book
Current Guyver Publisher is Kadokawa Shoten aka è§’å·æ›¸åº— http://shoten.kadokawa.co.jp/ One would have to contact the Rights and Acquisitions Department as well as the Author/Agent, in this case Yoshiki Takaya. (By the way in searching a possible agent, turns out Yoshiki does autograph events) Just be wary though. Recently A new branch of the company came to be, called Kadokawa Pictures. It's a new film division, so if someone has rights transferred there, than it will be hard to acquire the rights overseas.I wish everyone luck regardless.