[Archipelago] Walking in a Hardened World - Solidified on the Other Side

On the eve of moving away, a schoolgirl returns one last time to the forbidden alleyway where a mysterious older girl once took her by the hand, only to find a strange, warm protrusion jutting from the dead-end wall. When she gives in to the urge to grind herself against it, the ghost of that long-lost girl materializes and pulls her into a deep kiss—dragging her halfway into the wall as ecstasy overtakes confusion. What follows is a slow, blissful petrification: her soft body hardens into cracked stone, her bare chest and hips fusing permanently into the alley's surface as she moans that she and her spectral onii-chan will be together forever.