You need about 6k-7k coupons to get 80 fragments of Sage Naruto.

This is based on getting approximately 30 points per 10 keys.

an other event can give this naruto for less coupons ? or its a good deal ?

No clue. I don't follow up with Sage Naruto events. Sorry!

This event is one of the cheapest to but Sage Naruto, also you can count on 11 free keys daily.

77*3=231 points (in the worst of case)
So you can take almost 10 frags for free.

Then you need 70 frags more to take him:
1750/3=584 keys (always in the worst of case)
At max Sage Naruto will costs you 5840 coupons, probably less :).

thanks professional mexican sasuke!

Thanks you guys !

i wouldnt recommend getting sage naruto from these events... its bettewr to buy him through lucky board or mission immobilization.. for the extra things =

I agree. Power + Ninja is the way to go.

I neglected the Sage Naruto treasure for a long time and just kept doing Kages. When I got about everyone I wanted from Kage I had 20 Seals left so I just did 2 draw 10's on the Sage Naruto treasure and got Naruto the second draw 10.

Guys what about Nagato? Roughly how many keys i need to buy to recruit him? By the way in comparison to the last event, is this time round more cheaper to get him?

Its about 12k this event. Comparing to the last event, at the top of my head, I remember he's still about the same price. So not much difference.

Nagato is ~12 keys per fragment (assuming ~38 pts per 10 keys; which was the rate I got when I bought kimino in older event). at 120 coupons per fragment, he is quite a bit cheaper than the last time.

Also, you can get up to 12 free keys per day. If you have 9 free keys collected and do a wanted mission, you'll still get 2 additional free keys for a total of 11; then add on your daily free draw for 12.

Wow.. thanks for the info guys. Didn't know i could save a few more cps. Almost forgot that doing wanted missions are rewarded with keys as well.;P