The book was written by Takashi Nada, representative of the Ehime Institute for Contemporary Korean Issue in Japan.

It carried photos dealing with the immortal exploits of supreme leader Kim Jong Un.

It also carried his works, major calendar of his revolutionary activities and explanation on terms of the works.

The author wrote in a preface "The DPRK remains unchanged" that after the demise of General Secretary Kim Jong Il the DPRK has remained "unchanged" thanks to First Secretary Kim Jong Un who is successfully carrying forward the cause of Kim Jong Il. He said he wrote the book in a bid to make the Japanese know about it correctly.

He wrote in an epilogue "One should know the DPRK correctly" that world-startling miracles and innovations have been made one after another in the DPRK under the Songun leadership of Kim Jong Un. He put an emphasis once again on the wise leadership of Kim Jong Un who is successfully realizing the plan of Kim Jong Il for building a thriving nation.