I'm a Senior in High School, and I'm Being Told to Save the World as an Exorcist?

They say the gods of the Celestial Realm went on strike, neglecting their duties, all to find one woman who supposedly committed a heinous crime. Because of that mess, the world's gone to hell, and they want me, the granddaughter of a national shaman, to exorcise the overflowing evil spirits and wandering souls. The problem is. "I'm a senior in high school, you know?" Seriously, screw the world, I need to get into college. But what? My childhood friends are celestial envoys who declared a strike? Huh? I'm the reincarnation of the woman who committed the crime? And to top it off, my past life lover is in Avici Hell because of me? And one of them is completely missing? Hey, this is a ...