When the bakufu signed the Treaty of Amity and Commerce between the United States and Japan without permission of the Imperial Court, Shungaku came to the castle with Nariaki TOKUGAWA for protest and was suspended at home for going to the Castle untimely.
幕府が朝廷の勅許無しでアメリカとの日米修好通商条約を調印すると春嶽は徳川斉昭らとともに登城をして抗議し、不時登城の罪を問われて謹慎処分を下された。