Tetsu no Kizuna

Tetsu no Kizuna (鉄の絆. Bonds Cast in Steel.) is the opening theme song for the stage play Assault Lily: New Chapter. Composed and arranged by Tani Naoki, the track was featured in the compilation album Stage Selection - Sortie Three, which was released in November 26, 2025 under the label Lily Record.

Lyrics

Japanese
その場所でまた会える日まで待ってて 君との夢を咲かせて見せるから 悲しい言葉だけじゃ 君を語れはしないだろう 地続きの光が燈って咲いてる 砕けたガラスのように鋭い綺麗な残滓が 痛むのは愛の合図だろう 花束を抱えられるようになったの 君との記憶をなぞったから 絆を結んで聳える千尋の影を払って 大事な人の数だけ仲間へと繋ぐ理由になる 心の脆さに囚われ逃げ出したい声が響いても 支え合える独りきりじゃないと知っている ほら、君と歩くはずだった未来 守らなきゃ背負い続けて生きてく 眠れない夜の隙間 動くことのないドアから 帰らない君を待ってた 花束を抱えられるようになっても 枯れてる花がまだ香ってる 弱さを脱ぎ捨てて吹き頻く冷たい嵐へ向かって 大事な声の数だけ明日を願う理由になる 身を焦がすような暗い夢を見るより光射す方へ 向かえるのはあの日の言葉があったから ねぇ、君の分まで僕は生きてれたかな？ 悲しい言葉だけじゃ（言葉だけじゃ） 何も語れはしないだろう（何も語れはしないだろう） 悲しい言葉だけじゃ 思い出せなくなるんだろう 痛むのはきっと愛だろう 絆を結んでもう二度と解けないように 鋼鉄で出来た結束になれ 臆する今日を超えて行け 絆を結んで聳える千尋の影を払って 大事な人の数だけ仲間へと繋ぐ理由になる 心の脆さに囚われ逃げ出したい声が響いても 支え合える僕を呼ぶ声が聞こえる もう泣き叫んでも君はいない未来 守らなきゃ君を想う痛みを 鉄の絆を信じて その先へ
English
Wait right there for me Wait for the day where I can see you again You'll see it then How I made it bloom, this dream you and I once shared Sorrow alone won't say what needs to be said Our days together were so much more than that. The light of you still blooms today, never once did it dim. Like broken glass, what I hold of you now It's jagged, but still beautiful all the same The cut I feel has to mean it was love After all this time, I could finally bring our bouquet together. Because of you, and retracing memories we made. So with these bonds that i've forged, I can sweep away the shadows of any looming abyss. Too many people are dear to me, what other reason I need to hold my friends close? Still there's times where my brittle heart keeps me held fast Can't help but want to be set free. But when I cry out, we lean on each other. That's when I can feel it most that I'm not alone. You know, it should've been you that I walked this future with. I'll still keep it safe, with you always in my mind, I'll keep living. On sleepless nights, there were many times I stood by the door, waiting to hear you. Dreaming of you, who would never come back. After all this time, even though I brought our bouquet together Can't help but think withered flowers might still be fragrant. I was weak and helpless, but no more Here and now, I've turned to face this cold, biting storm. I stand strong. Too many voices are dear to me, that's enough reason to hope for tomorrow. When I dream, there's only darkness, a longing lit by the light of the love I feel. Only one reason that I can face that light it's what we've swore to each other on that day. But one thing worries me still. Do you think I've lived enough for us both? Sorrow alone won't say what needs to be said (Sorrow is not enough). Everything we've done is so much more than that (Everything we've done is so much more than that). Sorrow alone won't say what needs to be said Need to tell it all to help us remember If it hurts, doesn't that prove it was love? Here and now, I've forged my bonds so that they'll never break again. I'll cast this love we've made in steel if I have to So I can move beyond these days doubting myself. So with these bonds that i've forged, I can sweep away the shadows of any looming abyss. Too many people are dear to me, what other reason I need to hold my friends close? Still there's times where my brittle heart keeps me held fast Can't help but want to be set free. But when I cry out, we lean on each other. That's how I can hear it when you call out for me. I screamed, and I cried, but you're still gone My future is without you. I'll still keep it safe, trusting in the pain when I think of you Trusting in this love I've forged, cast in steel I'll move on ahead.

Personnel

Vocals

"At the Seeds' Frontier" Cast

• Oomori Rio / 大森莉緒 (Kondo Misaka)
• Makiura Itsuki / 牧浦乙葵 (Hasebe Touka)
• Sonohara Arisa / 其原有沙 (Luise Ingels)
• Shiraishi Mayumi / 白石まゆみ (Murakami Tokiwa)
• Hamaura Ayano / 浜浦彩乃 (Kiko Totori)
• Hayashida Mahiro / 林田真尋 (Imagawa Homare)
• Ito Yui / 伊藤優衣 (Yamanashi Hibari)
• Hata Misaki / 畑美紗起 (Kurokawa Nady Hanna)
• Otaki Saori / 大滝紗緒里 (Seike Tomoyo)
• Ando Chikana / 安藤千伽奈 (Imai Seira)
• Fujioka Sayaka / 藤岡沙也香 (Kojima Nadeshiko)

"When the Bugle Blooms" Cast

• Ishii Haruna / 石井陽菜 (Funada Kiito)
• Saiba Mizuki / 西葉瑞希 (Funada Ui)
• Nomoto Sora / 野元空 (Shiba Tomoshibi)
• Izawa Mikako / 井澤美香子 (Kaede Johan Nouvel)
• Haruka Risa / 遥りさ (Futagawa Fumi)
• Nakamura Yukari / 中村裕香里 (Fukuyama Jeanne Sachie)
• Nakagawa Rika / 中川梨花 (Kishimoto Lucia Raimu)
• Hoshimori Sana / 星守紗凪 (Amamiya Sophia Seren)
• Fujii Ayaka / 藤井彩加 (Aizawa Kazuha)
• Tamegai Hana / 集貝はな (Matsumura Fuka)
• Sasaki Yukari / 佐々木優佳里 (Kamigoori Marimo)
• Kitazawa Saki / 北澤早紀 (Ueda Imari)
• Muto Shiori / 武藤志織 (Amatsu Marei)
• Onose Mirai / 小野瀬みらい (Nakahara Mary Tomoyo)

Composer

• Tani Naoki / 谷ナオキ - Composition, lyrics, arrangement