Alone, unappreciated, and stuck in a miserable job, the only enjoyment in Katou's life is to indulge in his carnal fantasies. However, late one night he stumbles across an auction of a sinister book, said to be capable of making any woman sleep with the holder. Buying the book on impulse, Katou is quickly able to verify its effectiveness while discovering that it is capable of so much more... Intoxicated by its effects, Katou uses the book not only to soothe his base desires, but as a means to improve his social standing. But with such depraved methods at his disposal, where will this dark path lead him? Mesu Note follows Katou as he struggles to maintain his morality under the book's corrupting influence. [Written by MAL Rewrite]