Demon Hunter. by S. Barlow and S. Skidmore

You are the Hunter - destined to fight horror wherever you find it. The Japanese island of Okinawa is rocked by a massive earthquake - opening a fiery portal to the underworld! Terrible demons flood through, bent on tormenting humankind and making Earth a living nightmare. Only you can stand up to these unearthly horrors. Only you can send them back to the depths where they belong.