这是一部轻小说风格的低幻想类型的作品。它的世界氛围受到了Alice Soft的游戏《Night》的影响がるる 的强大影响力。机械魔法扫帚，如枪手扫帚和女巫之刃，已经成为作品的标志性物品。这款游戏通过在与TRPG无关的杂志上连载官方回放，并使用配音演员在网络广播上发布情报，逐渐受到欢迎。其衍生作品包括PC上同名的成人游戏，以及计划于2008年在PS2上发布的AVG游戏。自2007年6月起，Fami Tong PLAYSTATION+也连载了与本作相关的漫画《可变女巫》。这部由哈尔电影制作公司制作的动画连接了第一版和第二版，于2007年10月开播。
Elya, 20, is a student and a future ecologist. One day, Matvey, the head of a construction company, came to her university to discuss the development plan for an old forest park. Elya did not hesitate to crush his project. Matvey is very interested in girls' confidence, And used his usual influence method - he just tried to ; purchase She, but Elya doesn't need a sponsor. Then, Matvey was surprised by her indestructibility and placed a bet on Elya: romantic seven days according to his rules. If the girl still decides to leave after that, he will refuse to build a skyscraper in the forest park. When Matvey really paused design work, she agreed. Elya thinks she's a bit like the movie 'Beautiful Woman' The female protagonist in, but it turns out that Matvey is not the person she imagined.
