C205 Redsnow and Cave (1)

Just as I went in, the two of them suddenly disappeared. At this moment, I snapped out of my daze and wondered if I was tricked by Pluto's tricks again! However, beside the barrier there was a small wooden sign, on it was the symbol that the scrolls taught me, and it said "Inner World".

The name 'inner world' seemed to be something I had seen somewhere before