You play as both Nine and Aisha. You can switch between these two characters anytime you need to. They have different attributes and skills: Nine is a Blade, who does physical damages to Belzeds (undead creatures), and Aisha is a Sealer, who can seal Belzeds to prevent these undead creatures from reviving. Each character has different strengths and weaknesses, so switch them back and forth to successfully destroy the Belzeds!