道しるべ means a sign or guide that shows you which way to go. In the song, the light shining through the gap in the torn sky becomes a poetic 道しるべ, suggesting hope and a path forward after heartbreak.
This evocative word is less common than everyday terms for “direction,” making it a memorable way to explore Japanese imagery and symbolism.
Feel The Wind by Janne Da Arc is a breakup song where the singer is trying very hard to sound fine and keeps failing. He opens with light breaking through a torn sky, "ちぎれた空の隙間から" [through a gap in the torn sky], and says "今やっと歩いていけそうだよ" [now I finally feel like I can walk on]. Then the memories pull him straight back: "君はもういない" [you are not here anymore]. The English hook, "I'm feelin' the wind in the sky / Without your love", repeats so often it starts to feel like he is talking himself into it.
The best moment is a petty one, and I love it for that. He wishes her happiness, "君の幸せだけ願うよ" [I only wish for your happiness], but just before that he asks "綺麗にならないで" [don't get any more beautiful], because "これ以上は悔しいから" [any more than this would sting]. That word 悔しい is worth learning: it is the frustrated, bitter feeling of losing, with no neat English match. He also wonders "誰かと見上げているの?" [are you looking up at it with someone?] about the same sky. For learners, notice the soft ending よ in "しまうよ" [I'll put away], which makes his promise to pack the memories away sound gentle, almost like he is telling her directly.