Amane Tanikaze

Riku's younger sister, who was also a demon in her past life. She can be somewhat shy with strangers, but once you get to know her, she's actually a very lively girl. And despite how bratty she can act toward Riku, overall they have a pretty good relationship. She's also a huge gamer girl, and often stays up really late playing various online games. Unfortunately, this tends to backfire on her the following morning.