冷静なはずなのに、 心の中だけは制御不能の 暴走反応（runaway reaction）。 悩みも焦りも全部、化学反応式に置き換えて理解しようとする。 けれど青春の衝動は公式にない。 気づいたら “自分でも説明不能” な変化が起きている。 不安定なまま進むしかない。 「不可逆反応なら、もう後戻りする必要なんてない。」 [Lyrics] 反応式じゃ 説明できない衝動が 胸のビーカーで 沸点を超えていく 戻れないなら、それでいい 不可逆反応のまま 青春は進む activate しそうな 胸の臨界点が ちょっとしたことで すぐ溢れそうでさ 過飽和になった鼓動 ガラスのように鳴って 触れた瞬間だけ 世界が speed 上がる 理屈じゃ読めない 揺らぐ反応機構 正解なんてないよ 未完成のまま進行 沸点ギリで立ってる この feeling の中で もう back はできない 不可逆の合図がした 揺れる溶液みたいな 曖昧な僕らでも 反応速度だけは 誰より速かった “正解”なんて示されない式を抱えて 零れ落ちた日々が 今も光る 不可逆反応だ 戻れないまま 暴走するのを ただ見届けている 沸騰するような 胸のルミネセンス 止められないものを 止めようとしないで 飽和点を超えて 世界が揺れても 青春はきっと、壊れたって進む 吸熱 reaction のふりで cool ぶってみても ほんとは心の温度 乱れて止まらなくて 量子みたいに進路 急に jump して 未来の組成式を そっと rewrite していく 臨界値ぎりぎりの夢 触れたら heat 上がって 壊れそうな自分が 逆に生きてるみたいで 戻れない tonight を ぎゅっと抱きしめたら irrevocable way のまま 走るしかないんだ 誰にも測れない濃度で 僕は僕を保って 逸脱した値ばかりを “正しい”と呼んでいた 臨界値ギリギリの 危うい夢でも 触れた瞬間、僕は確かに生きてた あぁ 逆反応なんて起こらない あぁ 堆積した夜が燃えていく runaway reaction もう止まらない “壊れながら進むことも 間違いじゃない” 不可逆反応だ 戻れないまま 未完成のまま 未来を触れていく 飽和した心臓を 抱きしめながら 選んだ道だけが 僕の化学式だ 震える夜を抜けて 朝を迎えても 青春はきっと、無傷にはならない 沸騰しそうな夢を 手の中に抱えて 揺れる世界線を 走り抜けていく 変わりたい僕を 変われない僕が追い越す 不可逆反応のまま “壊れながらでも、生き延びていく” ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ Title: Irreversible Youth You should be calm, but inside your heart, an uncontrollable runaway reaction is occurring. You try to understand all your worries and impatience by replacing them with chemical reaction equations. But the impulses of youth have no formula. Before you know it, changes "even I can't explain" are occurring. You have no choice but to move forward unsteadily. "If it's an irreversible reaction, there's no need to turn back." [Lyrics] An impulse that can't be explained by a reaction equation is exceeding the boiling point in the beaker in my heart. If there's no turning back, so be it. Youth continues to move forward as an irreversible reaction. My heart's critical point, threatening to activate, feels like it's about to overflow at the slightest thing. My oversaturated heartbeat rings like glass. The world speeds up just the moment we touch. A fluctuating reaction mechanism that can't be explained by logic. There's no right answer; it continues unfinished. Standing on the brink of boiling point, this feeling. I can't turn back. It's an irreversible signal. Even though we're as vague as a shaky solution, Our reaction speed was faster than anyone else's. Carrying an equation with no clear "correct answer," The days that spilled out still shine. It's an irreversible reaction, unable to return. I just watch it spiral out of control. The luminescence in my heart is like a boil. Don't try to stop what can't be stopped. Even if the world shakes beyond its saturation point, Youth will surely move forward, even if it's broken. Even if I pretend to be cool and act like an endothermic reaction, In reality, the temperature of my heart is unstable and unstoppable. Like a quantum, my path suddenly jumps. Slowly rewriting the composition formula of the future. When I touch a dream on the verge of criticality, my heat rises. My fragile self feels like I'm living in reverse. If I hold tightly to tonight, which I can't go back to, I'll never be able to go back. Irrevocable way I have no choice but to keep running. At a concentration no one can measure, I maintain myself. I called only deviant values "correct." Even in a dangerous dream on the very edge of criticality, The moment I touched it, I was truly alive. Ah, there's no reverse reaction. Ah, the accumulated night is burning. The runaway reaction can't be stopped. "It's not a mistake to move forward even while breaking." It's an irreversible reaction, with no way back. Unfinished, I touch the future. Embracing my saturated heart. The path I chose is my only chemical formula. Even after surviving the trembling night and welcoming the morning, My youth will surely not be unscathed. Holding a dream that's about to boil in my hands, I run through the swaying world lines. The me who wants to change, the me who can't change, overtakes me. As an irreversible reaction. "Even while breaking, I will survive."
