Also known as: きあいさん
A Nijiura Maid. Her design is inspired by a Capcom character, similar to how Hayai (Nijiura Maids) is inspired by Sonic/SEGA. I'm not sure if there was a specific character in mind, but her appearance/personality seems like a combination of Kasugano Sakura and Wakaba Hinata.
Her name comes from kiai - "fighting spirit."