Gurenge (紅蓮華)

Strongly can-become reason (obj) learned, me (obj) taking advance-imp.

強くなれる ('be able to become strong') uses the potential of 強くなる. The line frames strength as a discovery — finding a reason to want it. 連れて進め is verb-stem chain ending in imperative: 'take me, advance.'

Wound-full-of that katana-on

傷だらけ ('wound-covered') uses the 〜だらけ suffix for 'covered in / full of' — usually for unwanted stuff (mud, mistakes, wounds). 刀 (katana) is the curved Japanese sword Demon Slayer's plot revolves around.

Warp heart, tremble hands as-for, want-to-grasp thing (subj) exists, that-only-sa

掴みたいものがある uses the existence pattern 〜が…ある with a 〜たい-modified noun: 'there is a thing I want to grasp.' Compare 食べたいものがある ('there's something I want to eat'). The 〜が...ある structure is the Japanese way to assert that an X-of-some-property exists.

Can-keep-changing thing-as-for, oneself-only, that's-all-sa

自分自身 ('oneself-self') is the doubled, emphatic version of 自分 — used when you want to stress 'YOU yourself.' The cleft 〜のは ... だけ frames the focus: 'the thing that can change is X — only X.'

No-matter-what can't-erase dream-and, can't-stop now-and

消せない and 止まれない are both potential negatives — 'cannot erase' and 'cannot stop.' The pair contrasts past/future (dream) and present (now), framing both as inescapable.

Someone-of-sake-for can-become-strong if, thank-you sadness-vocative

悲しみよ uses 〜よ as a VOCATIVE — addressing sadness directly as if it were a person. Compare English 'O sadness, thank you.' The vocative 〜よ is rare in conversation but common in lyrics, where speakers address abstractions, the wind, the moon. The line is the song's defining gesture: gratitude to grief.

Kind only-with can't-protect thing (subj) exists, I-know but

〜だけじゃ ('only-with isn't enough') is the casual contraction of 〜だけでは — used to dismiss something as insufficient. Pairs with the negative 守れない to make 'kindness alone is not enough to protect.' 〜けど is the casual contrastive — softer than だが, friendlier than しかし.

Below-surface-at tangle good-evil, see-through-be-visible hypocrisy-to divine-punishment

善悪 ('good-evil') is the antonym-pair compound. 透けて見える ('see-through-and-visible') = 透ける ('be transparent') + 見える ('be visible'). 偽善 ('false-good' = hypocrisy) and 天罰 ('heaven's punishment') are dramatic vocabulary fitting Demon Slayer's moral universe.

(English) talented-of-flower-than, kept-challenging-bloomed one-bloom (subj) beautiful

逸材の花 ('the prodigy's flower') vs 挑み続け咲いた一輪 ('the single bloom that kept challenging') — the song's central comparison. 一輪 is the counter for a single flower (輪 is the petal-circle counter). The line privileges the persistent over the prodigious.

Violent-ly was-paved wound-covered-of road-even, serious-of-me-only-to, appears

敷き詰める ('lay-down-and-pack' = pave / lay tile) — the passive 敷き詰められた gives 'was paved.' 本気の僕 ('the serious me') uses 本気 ('real intent / seriousness') as a prefix-modifier — common pattern: 本気の挑戦 ('serious challenge'), 本気の恋 ('serious love').

Hateful is

嫌だ ('iya da' — 'no / I don't want this / I refuse') is the bare emotional 'no.' Different intensity from 嫌い ('I dislike / I hate' as preference) — 嫌だ is the refusal in the moment.

Someone-of-laugh shadow, someone-of-crying-voice

笑う影 = 影 ('shadow / silhouette') modified by the verb-clause 笑う ('laughing'). 泣き声 ('crying-voice') is a stem+noun compound — same morphology as 笑い声 ('laughing voice') seen in Glory Days.

Everyone (subj) happiness (obj) is-wishing, no-matter-what

誰もが ('everyone') uses も + が together — も to make the negative-friendly indefinite ('anyone'), が to mark it as the subject. The combination 誰もが is more emphatic 'every single person' than just 誰も.