Bukubukuchagama (ぶくぶく茶釜) is one of the three female guild members of Ainz Ooal Gown and regarded as one of the Forty-One Supreme Beings by the NPCs of the Great Tomb of Nazarick. She is the older sister of Peroroncino and the creator of Aura Bella Fiora and Mare Bello Fiore.

For twelve years, the virtual world of Yggdrasil has served as the playground and battlefield for the skeletal lord Momonga and his guild of fellow monsters, Ainz Ooal Gown. But the guild's glory days are over, and the game is shutting down permanently. When Momonga logs in one last time just to be there when the servers go dark, something happens--and suddenly, fantasy is reality. A rogues' gallery of fanatically devoted NPCs is ready to obey his every order, but the world Momonga now inhabits is not the one he remembers. The game may be over, but the epic tale of Ainz Ooal Gown is only beginning... (Source: Yen Press)

A compilation film recapping the second half of the Overlord anime's first season, with a few extended scenes. 
Embracing his new identity and power as the fearsome overlord Ains Ooal Gown, Momonga continues to navigate the world of Yggdrasil in his quest to bring Nazarick to a new realm of glory throughout the game world. 
(Source: Crunchyroll)