The bulk update request #15697 has been approved by @Hillside_Moose.
mass update octopath_traveler -octopath_traveler:_champions_of_the_continent -octopath_traveler_ii -> octopath_traveler_i
create implication octopath_traveler_i -> octopath_traveler
create implication octopath_traveler_ii -> octopath_traveler
create implication octopath_traveler:_champions_of_the_continent -> octopath_traveler
Since it's a sequel, octopath traveler ii should imply octopath traveler.
Alternatively, this may be a good time to create a new tag for the Octopath Traveler series as a whole, with octopath traveler turning into something like octopath traveler i as a result.