The protagonist is Gianna, whose appearance is her most immediate and defining characteristic. She is described as a "busty sister," a visual novel trope denoting a nun with a voluptuous and powerful physique. In a story revolving around mind control and psychological domination, Gianna's strength, both physical and mental, is her ultimate weapon. Her narrative role is to be the immovable object that the villains' hypnotic magic cannot overcome.

"Dangan Seijo wa Saimin Mahou ni Makenai V15 Portable" is a visual novel-style game developed by the Japanese game developer, Meso. The game was first released in 2006 for the PC and later ported to the PlayStation Portable (PSP) handheld console. The title roughly translates to "The Heroine is Not Yielding to Hypnosis Magic V15 Portable".

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By Volume 15, the protagonist has endured significant mental fatigue, raising the stakes on whether she can remain incorruptible.

The original story is published on Shosetsuka ni Naro . While the web version has progressed, it has not reached a point equivalent to 15 standard light novel volumes.