Zetsubou no Elevator

A new year, with new friends.
The tragic heroine Kaede had gone over to her new friend's house.
However, the sudden urge to go to the bathroom comes.
And it obviously feels like .
She decides to rush home rather than ruin her new friend's toilet.
Little did she know that the elevator she was about to enter would lead her to despair...

[From DLsite English]