Teruko Chiga, the youngest of the triplet maids serving at Wet Crow’s Feather Island’s mansion, exudes an aura of quiet mystery. At 27, her near-silent demeanor and deceptive passivity mask her role as Iria Akagami’s elite bodyguard, a position upheld by her unparalleled close-combat skills. Her sister Hikari asserts her invincibility in such confrontations, a testament to her martial mastery.

Distinguished by dark green hair, matching eyes, and black-rimmed glasses, Teruko becomes indistinguishable from sisters Akari and Hikari once the frames are removed. Her maid’s apron, reinforced with iron plates, doubles as tactical armor. During the Mount Taketori conflict, she concealed her identity behind an iron mask to defeat the formidable Zerozaki Kishishiki, securing her epithet “Maid Mask.”

The sisters’ names—Akari, Hikari, Teruko—combine to form the phrase “Blood shines bright, blood glows, blood illuminates,” symbolizing their entwined fates. Existing records offer no further insight into Teruko’s personal history or growth beyond her duties as maid and protector, leaving her past shrouded in silence.