Eto-chan is a third-year junior high school student at Mizuno Junior High. She unexpectedly becomes involved with classmates Van and Dori, both deeply obsessed with the "Record of Lodoss War" franchise. Unlike them, she initially possesses no knowledge of the series.

Van and Dori recruit Eto-chan to help stage a "Record of Lodoss War" play for their school festival, aiming to promote the series. Her involvement centers on navigating the practical challenges of preparing and performing the play.

Eto-chan provides a grounded perspective against her classmates' enthusiasm. She participates primarily through interactions with Van and Dori rather than shared fandom. The narrative frames her inclusion as integral to the series' comedic dynamic.

Her role remains strictly focused on the school play context. Her characterization stems from being an outsider to the fandom, gradually drawn into the production efforts without additional background or storylines.