Natsu E No Tunnel Sayonara No Deguchi Free Better -

: While you do not age rapidly within the tunnel, the world outside moves on without you, effectively "stealing" your youth if you stay too long. The Mechanism

Depicted with a surreal, mirror-like floor and flaming maple trees, creating an otherworldly contrast to the rural town.

Pick one and I’ll provide it (I’ll assume standard romanized Japanese lyrics if you don’t specify).