The next sea starts with a quest, not a trade. Follow the NPC conversation in order and keep your current objective in mind before sailing to another island.
Start with the level requirement
The Military Detective route opens at level 700. Visit Prison and read the dialogue carefully. He directs you toward Ice Admiral at Frozen Village and provides the quest key. Follow the current in-game directions if an update has changed the wording.
Finish the route in order
At Frozen Village, use the key at the door in the Ability Teacher cave and defeat Ice Admiral. Return to the Military Detective, then travel to Middle Town and speak to Experienced Captain. This sequence is separate from simply reaching the required level.
Prepare before leaving
Set a spawn point you can return to, check your health and choose a fighting style you already understand. Our advice is to finish the access quest with familiar equipment rather than buying a new fruit just for one fight.
If the captain will not take you
Read the NPC response instead of repeating the same click. Check your level, whether the boss objective counted, and whether you returned to the detective. If you left mid-quest, revisit the relevant NPC and follow the current dialogue; do not assume a key or objective persisted.
Your first goal after arrival
Learn where your new quests and spawn point are before starting a trade. If you consider changing fruit for grinding, compare your build and budget first. Reaching a new sea does not make every expensive fruit a sensible upgrade.
Common questions
Can I skip the quest by trading?
No. Trading estimates do not unlock travel objectives. Follow the level and NPC requirements in game.
Do I need to buy a permanent fruit first?
This route does not require a permanent-fruit purchase. Use a build you can handle.
Sources and review
Original editorial guide. Community references consulted November 7, 2026; some indexed versions are several months old. Check recent changes in game. Examples and editorial advice are separate from documented rules.