However, when he had the Genpuku ceremony (coming- of-age ceremony for a young man after the Nara period) in 1348, he was granted the right to the imperial throne as the adopted child of Emperor Kogen, and was enthroned as the prince of Emperor Suko (his brother in law) on October 27 in the same year.
ところが、1348年（貞和4年/正平3年）に元服すると光厳天皇の猶子として皇位継承権が与えられ、その年の10月27日に義兄にあたる崇光天皇の皇太子に立てられた。