Kyoufu

Following the life of the student newspaper reporter Emiko, these are scary stories of experiences from Miyako High School:

Ubawareta Shinzou (Stolen Heart)
The school's mystery club sees the dangerous consequences of an innocent promise concerning heart donation after death between two friends.

Kyuuketsu Men (Bloodsucking Mask)
A girl who wears a demon mask from a shrine for a bad-luck-banishing drama club party ends up unable to remove it.

Dokuga (Poison Moth)
The science club leader creates a serum to preserve dead bodies perfectly, but it may have other unpredicted side effects.

Henshitsu
A couple take shelter from a storm in a strange house with a secret that might prove to be deadly.

(Source: MangaHelpers, edited)