TV-Series
Description
Eriko Takeda is the homeroom teacher for Class 3-C and school nurse at Sakaimachi Academy. She possesses thigh-length magenta hair, usually secured in a low ponytail, with bangs obscuring the left side of her face, and blue-green eyes. Her curvaceous figure is often clad in a nurse's lab coat over a revealing outfit displaying significant cleavage, a mini-skirt, knee socks, and lingerie-style panties, though she also utilizes a more covered black and blue battle suit.

Originally named Aichlikkwadrou (or Eiric Quadro) from another dimension, she worked as a scientist alongside her lover, Abel, researching the Tree of Vrinda and parallel world origins. They created a device for consciousness travel across dimensions. An experiment went awry, corrupting Abel's mind with an ethereal entity that attacked her and escaped. Seeking vengeance, she joined the Dimensional Inspector Bureau to apprehend cross-dimensional criminals. She devoted herself to tracking this entity, Ryuzoji, responsible for destruction across dimensions, leading her to adopt the alias Eriko Takeda and go undercover at Sakaimachi Academy.

At the academy, she presents herself as a recent transfer from Europe, exhibiting mysterious behavior like openly smoking in front of students and sleeping under the infirmary bed. She investigates local rumors, particularly those surrounding Kouzou Ryuzouji—the entity possessing the headmaster. Her cool, practical demeanor contrasts with moments where she guides troubled students like Takuya Arima, offering emotional support after his conflicts with Mitsuki Ichijou and Ryuzouji.

Her investigation intensifies as she monitors Ryuzouji’s actions and supernatural events at Sakaimachi, including curses and lightning strikes at Sword Cape (Triangle Mountain). She is aware of Takuya’s ability to travel between parallel worlds using the Reflector Device, though her precise understanding of its mechanics remains unclear. Her concealed true motives drive her to later confront Ryuzoji, fueled by her personal history with Abel, as the entity that corrupted him now inhabits Ryuzoji’s body.

Balancing her undercover role with interdimensional duties, she aids Takuya by revealing critical information about his father’s disappearance and its link to parallel worlds, becoming a key ally. Her mission culminates in a decisive battle where she dispatches Ryuzoji, achieving her long-sought vengeance.