Nevertheless, Oi launched a restoration campaign of Liberal Party in vain, and in 1890 (the following year), together with Chomin NAKAE and others, he declared the restoration of the Liberal Party on their own.
その後も大井は自由党再興運動を起こすが実らず、翌1890年に中江兆民らとともに自由党再興を独自に宣言した。