You go aboard a spaceship along with other crewmates. When you all least expect it, there is a dead body laying upon the floor that happens to be one of the crew members who you got on board the ship with. Someone among you is a killer and no one is trustworthy. You all agree to get into partners and you end up with the girl who calls herself "Depressed" and doesn't share her real name.

...

You decide to walk around with Depressed. Since she is quite silent, you start to feel really nervous.