From MangaHelpers:

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.

-- These stories and many more are found in the two volumes of Kyoufu. [tethysdust]