This conclusion evaluates the legacies of post-Fukushima activism, primarily focusing on Civil Society Organisations’ (CSOs’) advocacy that utilised the legislative system of Diet Member bills (DM bills). Comparing the implementation of the Nuclear Disaster Victims’ Support Law with those of other DM bills, it reveals pitfalls in implementing such bills, notably the lack of an advisory committee and guidelines for the implementation of the law. A comparison with the effectively implemented Child Poverty Law and Hate Speech Law highlights that strong local advocacy and local ordinances are crucial for the successful implementation of DM bills initiated by CSOs. The conclusion thus offers insights into developing strategies for CSOs’ future success in national advocacy and organisational strengthening.