Amid the intensifying military tension, Shojiro GOTO in Tosa Domain, who received advice from Ryoma SAKAMOTO (Senchu hassaku [the basic outline of the new regime drawn up by Ryoma Sakamoto]), proposed Taisei Hokan theory which would avoid armed clash to Yodo YAMAUCHI, the former lord of domain.
軍事的緊張が高まるなか、土佐藩では坂本龍馬の助言（船中八策）を受けた後藤象二郎が、武力激突を回避する大政奉還論を前藩主山内容堂に提案。