#005 of Atomic Bunko/Atomic Pocketnovels. The author seems to prefer the romanization as "Myrage" rather than "Mai Reiji".

Note, this is not my scan, there is some problem with cropping, which makes it impossible to joint the color page, other than that, everything else is neat.

There's no entry on mugi databse, if you are interested in physical version:
http://www.amazon.co.jp/gp/product/4860328167/
and here's the link to digital ver:
http://www.dlsite.com/books/work/=/product_id/BJ007144.html

Contents
Page 003, 004-005 Color illustrations
Page 006 Joint page of 4 and 5
Page 007-016 Gallery Preview (which you may delete after archive download)
Page 019 Character Intro

Page 020-061 第一章 蘇る魔王 -Beginning-
Page 062-089 第二章 姫様に乱心⁉ -After Effect-
Page 090-122 第三章 森の追跡者！-The Chaser-
Page 123-157 第四章 妖精族の里へ -Dances with Elves-
Page 158-195 第五章 再会、そして -Return to Nightmare-
Page 196-237 第六章 いざ魔海へ！-Sail Away!-
Page 238-279 第七章 魔王との謁見 -Black Line-
Page 280-327 第八章 蘇る聖女 -The Right from the Darkness-
Page 328-333 終章 帰還 -Curtain Call-

Page 334 あとがき/Postscript
Page 339 Bonus Wallpaper (1600 by 1200)

Base +14

This seems interesting, too bad it's a novel...

Base +1, Bane13 +31

So what's the basic intro of this one? The demon-looking girl body swaps with the princess or something?

Base +5, Bane13 -31