The sky was clear that day. On the rooftop of a certain Research facility, a woman looked up at the sky. "The stars are beautiful today too..." A day like any other. Or atleast... it was supposed to be. Until that terrible incident happened...

"To those of you who lack the courage to die alone. Shall we die together? I'm waiting for those who are interested to contact me." Date: XX Month, 20XX. Somewhere in Tokyo. - Inspired by a post on a certain social media, six people seeking to end their lives gather. At the arrangement of the organizer of the suicide meeting, they will have a final dinner before leaving this world together before dawn. However, it turns out that the six cannot die together; the organizer is discovered as a corpse. Did the organizer commit suicide? Or... was the person murdered? Amid various speculations, the remained five begin to debate.