When he was attending a fourth high school, he was in the same class as Tokuji Kameda, who would later become a House of Councillors member for the Socialist Party.

[3] However, in contrast to Eda, whose positions had gradually moved closer to the right-wing of the party, Narita's views shifted leftwards, and he began to advocate for the "Make War on Structural Reform" movement.

[4] On the very first day of 1964, Narita listed the following three weaknesses of the Socialist Party in an article for the Society News newspaper: However, he was unable to prescribe possible resolutions for these issues.

[6] Following the JSP's crushing defeat in the 1969 general elections, in which the party's total Diet seats (including both houses) fell below 100, Narita signaled his intentions to resign.

In 1974, Sasaki and Eda reconciled, and they joined forces into an anti-Socialist Association faction, and the disputes only furthered.

Narita proved unable to flex his leadership position in order to quell the internal party friction.

Narita resigned in 1977 to take responsibility for yet another House of Councillors defeat, and on 9 March 1979, he died suddenly from leukemia.