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フェノメノ 美鶴木夜石は怖がらない
Phenomeno: Mitsurugi Yoishi wa Kowagaranai is a freeware visual novel by Nitroplus adapted from the youth horror novel written by Hajime Ninomae and illustrated by ABe Yoshitoshi.
Yamada Nagito, a university student living away from home, needing a cheap place to live he finds out about a mysterious "House that grants wishes" on the market for a ridiculously low rent; he snaps up the house and starts living there. Afew nights in he starts hearing strange creaking noises. Each and every night he's assaulted by these torturous noises. The last straw is when he finds the number 7 carved into the wall, as if counting down to something. Yamada having an interest in the occult seeks help from a website he frequently visits: "Ikaigabuchi", which specialises in occult topics.
(Slightly edited excerpt from KipChu's blog)