"Boogiepop Phantom" is a story that primarily deals with change and how perceptions change as people grow older. The theme of change is represented not only by the ongoing struggle between the Towa organization and the evolved humans, but also by the way the look of the city is changing and through the growth of children into adults. Similar to the theme of change, the concept of moving on and not being stuck in the past is integral to the story as both Boogiepop and Boogiepop Phantom confront Manaka for what they perceive as keeping people stuck in the past. However, the series' view on change is presented ambiguously, as while the Towa organization seeks to prevent change in the world, it has world domination as its agenda. Boogiepop parallels this dualism as he encourages people to move forward with their lives while hunting down evolved humans thus preventing the possible transformation of society.