Eiko Aizawa 相沢栄子

A girl who works at the Lemon Beach House alongside her older sister.

After Ika fails to invade the surface, she forces them to work for her to pay off a part of the wall she destroyed. She is the younger sister to Chizuru Aizawa and older sister to Takeru Aizawa. She is typically the one who is the most annoyed by Squid Girl's antics, getting easily frustrated with them and not showing much concern for her well-being or safety.