In the corner of the sign post for the floating panels there is a graffiti saying:
To you, a participant in the Terrmian Festival!
At the end of this tower lies your dreams.
Hurry up!
Luck is yours to be had.
...Suspicious, but curious.
Should you give it a try?

It looks like you can cross by using the panels floating above the water.

When you returned, you noticed some writing at the back of the board:
There's nothing there, right?
In fact, there's nothing there. Hehe.
You're so angry!
Look down, look!
Once you read on and look down
there is a mysterious ticket lodged between rocks.
Was someone observing you
and left the ticket there?

Completion Target: Sign Post
- Reach the final Terrmian Tower

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Required actions:

1. Meet NPC: Terrmian Tower