In 1333, warriors including Takauji ASHIKAGA and Yoshisada NITTA put to an end to the Kamakura bakufu (Japanese feudal government headed by a shogun) and Emperor Godaigo initiated the Kenmu restoration, and in 1334, Imperial Prince Tsuneyoshi, Nariyoshi's brother, was appointed crown price, and Nariyoshi was designated Shogun of Kamakura-fu, moving to Kamakura to rule the Kanto region while being served by Tadayoshi ASHIKAGA, Takauji's younger brother, following the demise of the Kamakura bakufu.
元弘3年/正慶2年（1333年）、足利尊氏・新田義貞らにより鎌倉幕府が滅亡し、後醍醐天皇の建武の新政がはじまると、翌建武(日本)元年（1334年）、兄恒良親王が皇太子に指名され、成良は鎌倉府将軍となり、尊氏の弟である足利直義に奉じられて鎌倉幕府崩壊後の関東地方統治を目的に鎌倉へ下向する。