LuigiFlower
All will participate. One is guilty. None are safe.
"When It's Night" is a locked-room progressive whodunit centered around 15 high school honors students who were selected to be invited for a mostly informal get-together hosted by the school's founder, ██████████, in celebration for being the school's most successful alumni.
All of them decide to come, but once they explore the area, they find multiple incriminating sights, including dead bodies, and then soon realize they have been trapped inside.
When night comes, someone has been killed, and the students find out that one of them is a murderer.
It is now up to the rest of the high school students to solve the mystery and find the murderer...
...if they can.
The beginning of the story takes place on Thursday, May 23, 2030.