There's Only One Resurrection Slot

You wake up aboard a luxury cruise ship.

The people on board tell you this is a three-day, two-night voyage, and that the guests have been invited because they lost family members or close friends.

Once the ship leaves shore, the dead whom they miss will come back to life on board, just as they were before they died.

But when the voyage ends, only one of the dead can truly return from the underworld.

You have lost your memory and know nothing about what's going on.

Are you one of the dead, or a guest? Who did you come here for?

Detectives, sorcerers, people with supernatural abilities...

Solve the mystery before they do, or you'll lose everything.

* The main story is told in third person.

* Primarily a crossover with Umineko and Detective Conan. It's fine if you haven't read Umineko.

Theme: Friendship