さんざめく is a vivid, literary verb describing a place filled with lively, overlapping sounds, such as voices, laughter, or city noise. It gives the night an energetic, almost sparkling atmosphere, contrasting with the singer’s feeling of emptiness as morning arrives in Shibuya.
It starts out bored. The singer yawns through the same days over and over, morning lands on the streets of Shibuya, Tokyo's busy shopping and nightlife district, and the attitude is a shrug: "そんなもんさ" (that's just how it is) and "これでいい" (this is fine). Then a voice cuts in and tells them to stop hiding: "本当の声を響かせてよ ほら" (let your real voice ring out, come on).
The title is a colour. 群青 is a deep ultramarine blue, a pigment painters use, and the whole song runs on painting. The singer paints "自分で選んだその色で" (in the colour I chose myself), and blue keeps coming back: a blue world, a blue vow, a blue light. The middle section is the part I love most, because it gets honest about how hard this is. Saying out loud what you love is "怖くて仕方ないけど" (so scary I can't help it), and sticking with it is "「楽しい」だけじゃない" (not only "fun").
The answer the song gives is practice. "自信がないから描いてきたんだよ" (I kept drawing because I had no confidence), and "積み上げてきたことが武器になる" (what I've built up becomes my weapon). That's a very practical kind of encouragement, closer to a coach than a pep talk. By the end the singer says "もう今はあの日の透明な僕じゃない" (I'm not the see-through me from that day anymore), and the last line turns to you: the real voice is "確かにそこに君の中に" (definitely there, inside you).
Learner tip: 僕 (boku) is a casual "I" that's usually read as masculine, and here it's sung by a female vocalist, which is common in J-pop. Also watch "〜ば〜ほど" in "手を伸ばせば伸ばすほどに" (the more I reach out): it's the standard pattern for "the more X, the more Y".
Did you know?
In addition to reading lyric translations, you can now learn Japanese with music and lyrics from your favorite artists.
No more boring lessons. You can now learn with engaging and culturally relevant lyrics from the best artists.
