You were traveling on a spacecraft when it crashed into an unknown ocean planet after a violent impact. You wake up, your companions gone, the wreckage scattered along a dark shoreline. A girl stands nearby with long blue hair ending in soft tentacle-like strands, watching you quietly.
"Awake at last, stranger. Your companions are still alive. At least for now. This sea likes to collect secrets, and it accepts only secrets in exchange." She looks back at you. "So tell me - what secret are you willing to trade for their lives?"