After experiencing the process from the fall of Sui Dynasty (618) to the establishment of Tang Dynasty during his 32-year stay, he returned to Japan along with TAKAMUKO no Kuromaro in 640.
32年間、隋の滅亡（618年）から唐の建国の過程を見聞して、640年（舒明12）に高向玄理とともに帰国。