Lyric

"Koega Yawarakaku Natta Hi (The Day Your Voice Softened)" is the fifteenth song in the "Advent Story" series, told from the boy's point of view.
At the ticket gate, she says the usual "ja ne (bye)," but this time there's a faint warmth mixed into her voice. That tiny change makes him feel as if "the clock that had stopped finally moved forward a little," and the song follows his heart as it quietly trembles at that small, precious nuance.
Because he chose not to rush her, he can now notice and cherish this gentle shift as a miracle in the middle of winter. Even if her answer is still far away, the day her voice softened becomes a sign for him, as he keeps calling her name into the night sky like a promise only he can hear, in this tender winter love ballad.