Seiko is a high school student or part-time student at a local restaurant. Like Raphael, she is the restaurant's mascot. She works hard and Raphael always helps her with a smile. That's why she fell in love with Raphael. Because Raphael's personality is like a goddess in her eyes. Seiko often gets involved in the chaos caused by the gods who visit Raphael. This makes her realize that Raphael, she is not just a goddess, but a true goddess. However, Raphael asks her to keep this a secret between the two of them, making her fall in love with Raphael even more.