Pixiv Title: 変わっていく街と変われない心
Commentary: お気に入りのぬいぐるみを捨てて　大人になるんです

Title: The changing town and the unchanging heart.
Commentary: Throwing away her favorite teddy bear to become an adult.

Then kicking herself 15 years later when she learned it was a limited version that goes for $1000 on auction sites. I think we've all been there with some treasured childhood item.