ไธ็็ท literally means โworld line,โ referring to a possible timeline or alternate reality. In the song, the narrator wishes he could meet her in a different world where their personalities and values matched, giving the word a memorable science-fiction-like sense of lost possibilities.
It is more distinctive than an everyday word for โworldโ because it evokes all the lives and outcomes that might have existed, making it especially fitting for this bittersweet breakup song.
Pretender is a breakup song where the breakup never quite happens. The singer knows from the first line how this love story ends: "ๅใจใฎใฉใในใใผใชใผ ใใใฏไบๆณ้ใ" (my love story with you, it went just as I expected). Once it starts, it is "ใฒใจใ่ๅฑ " (a one-man play), and even standing right next to her he is "็ตๅฑใใ ใฎ่ฆณๅฎขใ " (in the end, just an audience member). That theater image is the whole title. He is the pretender, acting out a romance only he is in.
The part I love is how stubborn he is about letting go. He wishes for another timeline, "ๅบไผใใไธ็็ท ้ธในใใใใใฃใ" (if only I could have chosen a world line where we meet). ไธ็็ท (world line) is a sci-fi word Japanese fans use for alternate realities, and here it is a very nerdy way to say "in another life." Then the chorus admits the hard truth, "ๅใฎ้ๅฝใฎใใใฏๅใใใชใ" (the person you're destined for isn't me), and immediately caves: "ใงใ้ขใ้ฃใใฎใ" (but it's hard to leave). Watch the wordplay in "็ใใ ใใใงใ ็ใใช ใใใใ" (it hurts, no, but it's sweet, no no): ใใ means both "ugh/no" and sets up the back and forth of a guy arguing with himself. After all that confusion, the only thing he is sure of is "ใๅใฏ็ถบ้บใ ใ" (you are beautiful), and by the last line it has grown to "ใใจใฆใ็ถบ้บใ ใ" (you are so beautiful). It is a bit much, and that is exactly why it works.
Official HIGE DANdism (Official้ซญ็ทdism, often shortened to Higedan) is a Japanese pop band formed in Shimane in 2012. The four members are Satoshi Fujihara on lead vocals and keyboards, Daisuke Ozasa on guitar, Makoto Narazaki on bass and Masaki Matsuura on drums.
After an indie start, the band made its major-label debut with Pony Canyon in 2018 with "No Doubt". "Pretender" (2019) became their breakthrough, and they performed it on NHK's Kohaku Uta Gassen that year. Anime fans know them for "Cry Baby", the opening of Tokyo Revengers, and "Mixed Nuts", the opening of Spy x Family.