[BPM: 180, high energy, piano and accustic guitar-driven J-pop rock] [Genre: J-pop with piano-rock elements] [Production: Piano lead with signature running patterns, driven rock instruments, festival ambience, punchy drums with soft percussions, dramatic dynamics, layered piano and strings, emotional buildups, moonlit romance atmosphere, dreamy synth touches] [Vocal Style: Female J-pop, youthful energy, emotional storytelling] [Structure: Drop Chorus > Verse 1 > Chorus > Verse 2 > Chorus > Bridge > Drop Chorus > Final Chorus] [Drop Chorus Intro] [Piano: Signature riff] C5|-5-3-5-8-5-3-| G4|-3-1-3-5-3-1-| [Vocals: Soft, dreamy] 約束するよ 月の下で My secret love, my hidden heart [Add light hi-hats] [Bass: Gentle entrance] [Verse 1] [Piano: Running eighths] [Drums: Light beat] [Vocals: Youthful, secretive] クラスの窓際で チラッと目が合って [Bass guitar: Simple quarters] 周りの目気にして すぐに背を向けた [Piano: Building intensity] 誰にも言えない この胸の高鳴り Bad boy だけれど 優しい瞳 [Pre-Chorus] [Drums: Add crashes] [Electric guitar: Clean strums] [Vocals: Growing emotion] お祭りの夜に 二人でこっそりと [Piano accent] D5|-8-5-3-5-| 私だけが知ってる 君の本当の声 [Chorus] [Electric guitar: Power chords] [Drums: Full rock beat] [Bass: Driving rhythm] [Piano: Strong accents] [Vocals: Strong, passionate] 約束するよ 月の下で 変わってゆく 君と私 Like fireworks in summer night 光る想いを抱きしめて [Piano runs with vocals] 誰も知らない 秘密の場所で 永遠の愛を誓うよ [Verse 2] [Piano: Gentle arpeggios] [Drums: Light kick and snare] [Vocals: Intimate tone] 噂は聞いてた 不良と言われてた [Add strings: Soft sustained notes] でも私だけが 見てた優しさを [Bass: Melodic line] [Add electric guitar arpeggios] 金魚すくいで 見せた笑顔も 全部全部 大事な 私たちの物語 [Pre-Chorus 2] [Drums: Build intensity] [Add chime sounds] [Vocals: Determined emotion] 人の目を避けて 抜け出した二人 [Piano melody] E5|-5-3-5-8-| このまま走って どこまでも行けるよ [Chorus] [Electric guitar: Strong chords] [Drums: Full intensity] [Bass: Driving eighths] [Piano: Strong rhythm] [Vocals: Full emotion] 約束するよ 月の下で 変わってゆく 君と私 Like fireworks in summer night 光る想いを抱きしめて [Piano runs intensify] 誰も知らない 秘密の場所で 永遠の愛を誓うよ [Bridge] [Piano: Soft arpeggios only] [Vocals: Intimate, vulnerable] 怖かったの 最初は でも今は違うの [Add strings: Gentle swells] Your promise changes everything 信じてる your loving heart [Drums: Building fills] [Bass: Rising line] 花火が上がる前に 言いたい言葉がある [Drop Chorus] [Electric guitar: Power chords] [Drums: Explosive beat] [Bass: Strong rhythm] [Piano: Forceful chords] [Vocals: Most powerful, release] 約束するよ 月の下で 新しい 私たちへ This moment frozen in time 輝く夢を掴んで [All instruments strongest intensity] 誰にも邪魔させない 二人だけの誓いよ [Final Chorus] [Electric guitar: Melodic lead] [Drums: High energy] [Bass: Active line] [Piano: Strong melody] [Vocals: Pure joy and emotion] 約束するよ 月の下で 変わってゆく 君と私 Like fireworks in summer night 永遠に続く Love story [Piano and percussion climax] この気持ちは本物で 永遠に変わらないよ [Outro fades to end] [Piano: Return to gentle riff] [Piano: Call back to signature riff] C5|-5-3-5-3-1--| [Other instruments fade] [Vocals: Soft, content] 月の下で 約束した Our secret moonlight promise [End] This moment frozen in time 輝く夢を掴んで [All instruments strongest intensity] 誰にも邪魔させない 二人だけの誓いよ [Final Chorus] [Electric guitar: Melodic lead] [Drums: High energy] [Bass: Active line] [Piano: Strong melody] [Vocals: Pure joy and emotion] 約束するよ 月の下で 変わってゆく 君と私 Like fireworks in summer night 永遠に続く Love story [Piano and percussion climax] この気持ちは本物で 永遠に変わらないよ [Outro fades to end] [Piano: Return to gentle riff] [Piano: Call back to signature riff] C5|-5-3-5-3-1--| [Other instruments fade] [Vocals: Soft, content] 月の下で 約束した Our secret moonlight promise [End]