笑顔の行方
稲垣潤一 & 水樹奈々 Lyrics

The lyrics of 笑顔の行方 by 稲垣潤一 & 水樹奈々 depict a nostalgic reflection of a past self through the lens of a graduation album. The first page of the album features a photo of a young and innocent version of oneself, deeply immersed in laughter. The singer of the song longs to hold that carefree girl again, to embrace her and shower her with affection. The lyrics describe how the present self has changed and learned how to do things such as doing their hair and painting their nails. Despite not being able to replicate the same smile as before, the singer endures by replacing it with the courage to reach out and seek new directions, all of which lead toward the subject of their admiration.

The chorus of the song expresses the feelings of isolation and sadness that come with the inability to express one's love and affection to their loved one. The singer describes themselves as crying and feeling overwhelmed with emotion, unable to move on from the past. However, they reassure themselves that letting go doesn't mean losing anything and gather the strength to say and reach out, confident that it will eventually find its way to their loved one.