English Title: Simple 2000 Series Vol.34: The Renai Horror Adventure ~Hyōryū Shōjo~Horror and dating sim, two great tastes that taste great together. Or something. As usual for the Simple 2000 series, this is exactly what it says on the box. The story in short is: You and a bunch of girls from your school go off to explore a haunted mansion for some end-of-summer fun, only to get trapped there after a floor collapses and you find out that, oh hey, this place really is haunted and filled with horrifying eldritch abomonations. But just because you're scrounging for food, fighting off monsters, and trying to keep from dying doesn't mean you can't make a move on your classmates, right?
Japanese Title: SIMPLE2000シリーズVol.34 THE恋愛ホラーアドベンチャー 〜漂流少女〜
Publisher: D3 Publisher
Genre: Dating Sim / Horror
Released: Jul. 24, 2003
Product Codes: SLPM-62343 / JAN 4527823992054
Basically the gist of it is that each day you choose one girl and go off exploring, looking for food and a way out. Each girl has their own specialty, like scavenging for food or warding off monsters. You have to ration food amongst your companions, and if you run out, people start dying.
The character art is courtesy of lolicon manga artist Takeshi Ohta, whose website I won't link here because it's probably illegal to even look at in this country.