Lyric

This song uses "domain" as a metaphor for a place where one belongs, while also exploring themes of personal identity and self-validation.
The protagonist searches for the meaning of life and their true self, yet finds no clear answer, experiencing an emptiness much like a "404 Not Found" error. However, they gradually realize that these answers cannot simply be given by someone else-they must be built and defined for themselves.
Finding a place to belong requires time, effort, and even a cost; if neglected, it can be lost. Even so, rather than remaining trapped by past pain and uncertainty, the protagonist keeps moving forward, telling themselves to let go and forget. Along the way, they search for a "protocol" that can connect them with others.
Ultimately, the song portrays a journey of self-discovery, the creation of one's own identity, and the desire to form meaningful connections with other people.