Simple 2000 Series Vol. 34: The Ren'ai Horror Adventure: Hyouryuu Shoujo

It's a summer night and school shouldn't be where you're at but there you are with five lovely classmates. It's a group study session but an strange occurrence plunges the school underground and traps you and cohorts inside the storied halls of learning. Use the resources of your classmates and your own knowledge to find a way out of the school and return to your plain-Jane life.

All this would be fine and simple were it not for the strange creatures now roaming the halls. Even though monsters are afoot, love may blossom between you and one of your classmates during the time of strife and love horror.