クランクアップ is a Japanese film-industry term meaning the completion of filming, or the moment a production officially wraps. It comes from the English phrase "crank up," referring to the old practice of starting a film camera by turning a crank.
In the song, the couple's life is treated like a movie, but they cannot decide when their "final shoot" will happen: クランクアップがいつなのか僕らには決められない. This gives the word a romantic, memorable meaning: continuing to create life's best scenes together for as long as life lasts.
Official HIGE DANdism open this one by telling you exactly what you're about to hear: 「これから歌う曲の内容は僕の頭の中のこと」 (the song I'm about to sing is about what's inside my head). The whole thing is a love song dressed up as a movie. 「主演はもちろん君で 僕は助演で監督でカメラマン」 (the lead is you, of course, and I'm the supporting actor, the director and the cameraman). He's filming it all on 「目の奥にあるフィルム」 (the film behind my eyes), which is a lovely way of saying memory.
He even plays the trailer. We get 「初めて喧嘩した夜の涙」 (the tears on the night of our first fight), then the making up, and then the bit he's proudest of: 「ほら ここで君が笑うシーンが見どころなんだからさ」 (look, the scene where you smile here is the highlight). 見どころ is a handy word: it's the "must-see part" of a film or a trip. My favourite line is the honest, funny one about the future: 「今でも余裕なんてないのにこんな安月給じゃもうキャパオーバー!」 (I already have no slack, and on this cheap salary it's capacity overload!). He's guessing the cast will grow with kids in ten years, and he's already panicking about money. キャパオーバー is Japanese-English slang from "capacity over", meaning you're past what you can handle.
The film words keep coming. 「苗字がひとつになった日」 (the day our surnames became one) is a gentle way to say their wedding day, since in Japan a married couple shares one family name. 「エンドロールなんてもん作りたくもないから」 (I don't even want to make anything like end credits) and 「クランクアップがいつなのか僕らには決められない」 (we can't decide when filming wraps up) both mean he wants this to last a lifetime. クランクアップ is the Japanese term for the last day of a shoot. And the title? 「一生分の長さを ざっと115万キロ」 (a lifetime's worth of length, roughly 1.15 million kilometres): that's how much film he's loaded. It ends on a promise to keep rolling: 「撮影を続けようこの命ある限り」 (let's keep filming for as long as we're alive). Sweet? Very. A bit much? Maybe, and that's the charm.
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