Born to a samurai household in Tosa Domain during the late Tokugawa era, he grew up amid rigid status hierarchies and domain politics. The Tosa tradition of reform-minded retainers shaped his early sense of public duty.

As a young retainer, he joined Tosa administrative and military circles where debate over Western threats and domestic reform intensified. Networks later linked him to figures who would drive the Meiji Restoration from the provinces.

During the crisis of the late shogunate, he backed Tosa initiatives that pressed for political restructuring and the return of authority to the imperial court. The collapse of Tokugawa power opened space for ambitious national reform.

He participated in the Boshin War, the civil conflict that established the Meiji government under Emperor Meiji. Battlefield experience and postwar administration convinced him that legitimacy required broader consent than samurai fiat.

After the Restoration, he served in the new central administration as leaders from Satsuma, Choshu, and Tosa built modern ministries. He observed how the emerging oligarchy concentrated decision-making among a narrow elite.

He left government in the Seikanron debate, when leaders split over whether to launch an expedition against Korea. The resignation signaled his break with oligarchic policymaking and pushed him toward organized rights activism.

He helped submit the Tosa Memorial (Tosa kenkoku) petitioning for an elected national assembly and constitutional government. The document framed representation as essential for national strength, not merely a Western import.

He co-founded Aikoku Koto (Public Party of Patriots) to channel petitions and local agitation into structured national politics. This experiment pioneered party organization in Japan and challenged official suspicion of mass mobilization.

Working with activists and local leaders, he promoted jiyu minken ideals through speeches, associations, and petitions across the country. The movement linked rural grievances to constitutional demands, alarming police and prefectural officials.

He supported nationwide coordination among rights groups that organized rallies and drafted petitions for an elected legislature. These efforts created a political vocabulary of 'rights' and 'public opinion' that spread beyond former samurai circles.

He founded Jiyuto (Liberal Party), building a national organization that could contest elections and discipline local factions. The party pressed for a constitution and assembly, forcing the government to set a timetable for parliamentary politics.

He survived an attack by a right-wing assailant during a political tour, an episode widely reported in the press. His defiant stance afterward strengthened his image as a leader willing to risk his life for constitutional freedoms.

With the Peace Preservation regulations and police crackdowns, rights groups faced arrests and restrictions on meetings. He navigated internal splits between moderates and radicals while trying to keep electoral politics alive.

As Japan prepared for constitutional government, he helped reconstitute liberal networks and train candidates for upcoming elections. The transition demanded compromise with bureaucratic rules while preserving pressure for genuine representation.

After the Meiji Constitution took effect, he took part in early Diet politics where parties negotiated budgets and policy with the cabinet. The new arena tested whether popular representation could restrain the Meiji oligarchs in practice.

He served as Home Minister under Prime Minister Matsukata Masayoshi, overseeing police, local administration, and elections. The post placed him at the center of tensions between party politics and state control of public order.

As Ito Hirobumi and others reorganized politics into larger parties, his earlier liberal organizations lost dominance. He remained an influential elder whose career embodied the shift from petition movements to parliamentary bargaining.

In later years he was celebrated by supporters as a pioneer of civil rights and constitutional government. Public commemorations and political memoir culture elevated him as a founding figure of Japan’s party tradition.

He died as Japan entered the Taisho era of mass politics, when parties and the press wielded growing influence. His long campaign for representation helped normalize the idea that government should answer to citizens through institutions.