 If you liked
Zekkyou Gakkyuu
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 ...then you might like
Ningyou Saisei Koujou
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In both mangas, someone tells a tale of something that happens (in Zekkypu Gakkyou a girl named Yomi tells tales in which people have done things to lead to their misfortune, whereas in Ningyou Saisei Koujou it's a salesperson who sells things at a price; also leads to their misfortune). Both end in tragedy (well, Zekkyou Gakkyou has more than one story; most end in tragedy). However, Zekkyou Gakkyou is ongoing and Ningyou Saisei Koujou is just a oneshot.