Zakuro no Aji

The story is set in a five-story office building on a cold winter evening. The protagonist (default name Domon) is working on a story for a monthly science fiction serial. As he goes to visit the editorial department, a series of earthquakes cause the building to collapse and trap everybody inside. Attempting to find an escape, Domon heads into the basement, and depending upon a decision made early in the game, he may run into anything from zombies to demons.

[From endaso]