Akihito has two sons, 1 daughter. Therefore, after he abdicated, the royal meeting decided that Deren would inherit the throne, "there will be no crown prince for the time being."
In this way, if there is no accident, the next three generations of succession to the throne will be like this. Today, Emperor Akihito is the125th generation emperor of Japan, and Naruhito will be the126th generation emperor after he ascended the throne. Then Deren's brother Wen Ren will be127th generation; Wen Ren's youngest son, You Ren, now 13 years old, will be the emperor of 128.
When Emperor Akihito officially abdicated
According to the research of the Japanese royal meeting, Akihito officially abdicated on April 30th, 20 19.
According to the person in charge of the royal institution, Akihito proposed to abdicate in August 20 16, and the Japanese cabinet studied and promulgated the "abdication before death" bill in August 20 17. Because Japan has never had an emperor who abdicated alive for more than 200 years, Akihito's pioneering work needs Japanese legislation to provide supporting services.