If you are really full on f2p then yeah, it's gonna be a rough time. But if you spend just a little (enough for the monthly card and daily spins for coupons on the wheel) and you save all of your scrolls until level 70 sage treasure, then you should be able to do a 6x10 pull which gives you a chance at naruto (about 33% chance).

Even if you don't get him, the other two rares in the sage treasure are really good and worth it. Don't bother with the pains, too many rares to draw from in that pool.