I love stories about people figuring out they are dead, and also stories about helping the dead find peace, I wish this was part of an anthology series about people getting into the elevator instead of a one shot.
I disliked it. Not a fan of works treating suicide with the same seriousness you would treat changing jobs or changing colleges. And it wasn't even yuri.
I think it was handled well. The one left behind is grieving and torturing herself with thoughts of "if only I had been there". People who didn't know her talk about the morbid fact she died in the building they're all in. While the MC is clearly upset but is also worried about her friend (maybe because she thinks she'll do the same as her) so she focuses on that.