Mari-Kari centers around a grade school girl and her super-spooky, revenge minded wraith-of-a sister. Calamity and hilarity are hard-wired in. Set in the ordinary world of Mari, viewers see how her supernatural sisterly bond affects her life at home, at school, on the bus, at the mall - and how her life and her sister's lack of one makes them a very scary pair. Theirs is a relationship that has dire affects for anyone who tries to get in the middle of it. A cast of unforgettable characters round out the Mari/Kari duel, from Shari - the Perez Hilton of Gilles de Rais Elementary to Larry - a lovable dead kid who lives in the shed behind Mari and Kari's house.