Location: Konoha gakure/Library
Basically in the Library or konoha gakure you buy a book, or rent out a book to read, you choose what kind of book and they give you different outcome here are some of the outcomes I thought might be possible.
Horror: You pick up a Horror book and pay Hinata X gold.
You sit down and read the Novel, it sends chills up your spine, you feel very cowardly, as such you LOSE one forest fight due to the fact you dont feel brave enough to take on a monster yet!
Romance:
You pick up a Romance book and pay Hinata X gold.
You try to imagine yourself as the hero and ten-Ten as the beautiful princess, in the end the character you imagine yourself as is shunned and emotionally crippled, you imagine what this would be like in real life and LOSE some charm!
Of course there would be bonuses I'm just trying to let you picture what some of the bad things might be.
Some categories:
Action
Horror
Romance
Adventure
Random (Can give any of the above or some diaries/biographies* of famous characters.)
*Whichever you prefer