An ancient race of monsters who can assume human form called the Grongi begin to murder humans in Tokyo after being awakened. The only one who can match their power is a young adventurer named Godai Yuusuke, who gains the power of Kuuga after its previous bearer passes its power to him.

(Source: MangaUpdates)

Miyu is an eternally youthful vampire princess. She is the Guardian, whose duty it is to return the Shinma - god demons that prey on humans - to the dark. Her only companion, and protector is Larva, a Western Shinma who is bound to serve her. Together, they hunt stray Shinma across Japan. New Vampire Princess Miyu is the sequel about Miyu and the war with awakening Western Shinma, Larva's old fellows...

A young girl, Makora, lives in a strange house without any mirrors. One day, she has a strange dream and when she tells her mother, she seems sad all of sudden. On the way to school, Makora starts seeing strange things and when she comes back home, her mother is nowhere to be found. Only a weird guy seems to know something, he has a message for her from her mother: "Find the mirror"
(Source: MU)