*dies*
Am I the only person that does not have any knowledge with this game? xD
Based on your age, I don't think that's a bad thing. It's pretty graphic. It was originally rated as "M 15+" but I don't think that rating exists any more, so now it's just "M 18" if I recall correctly. Either way, I'd recommend you maintain your lack of knowledge regarding this game until you're at least 13 or 14. It's not terribly gory due to the lack of highly detailed 3D environments, but it's not exactly pretty.
Also, there's a MONDO rainbow in Monster Hunter Portable 2nd G, the most popular PSP game in Japan for almost a year now. I'm pretty sure rainbows are hardcore if people who slay 20-megaton dragons on a regular basis can tolerate them.