Initially Core No. 695, she was named 'Rokuko Dungeon Core' by Keima after he arrived. She is a Dungeon Core, the heart of her dungeon. Despite being in existence for around ten years, she was just named 'Ordinary Cave' by outsiders, due to being a weak dungeon with only a single room. However, Keima's arrival changed things up. She is 'partners' with Keima, but the meaning of being partners is uncertain. She is able to switch between her natural 'loli' form, and her alternate form she puts on for good looks. Her favorite food is melon rolls.