カモネギ号が魔法剣でいっぱいになる

You woke up, in the world of magic swords.
You don't know anything about the catastrophe five years ago in This world.
You'll be working as a radio operator, and you'll be attacked by a black magic sword.
Who is the "Messenger", who knows the terrible power of a black magic sword, the identity of a magic sword, and everything?
Your choices determine the fate of this world.