S-Ranking a Mission requires 90% or better in each of the categories at the end of each match within a story section. These are usually % Health left, Continues used, % QTE complete. Bonus objectives and time spent have no bearing.
Health must be 90% or better (you will kick yourself the 3rd time in a row you finish on 89%
)
Continues are self explanatory, don't fail the fight for a S-rank.
QTE are the various scenes that play out at the beginning/end, you'll know when these are happening as Stars appear at the top middle of the screen.
There are also various in-battle QTE which while not counted, generally stop you from taking massive damage/dealing out extra.
This Mission has a single battle with QTE and an oversize battle at the end.
Taka vs The Hokage
A much harder battle to S rank due to the number of opponents try and keep a reserve or chakra to substitute when attacked as all three Hokage attack hard and fast. Once 3 bars of health are gone the First hokage awakens and summons the Wood Golem, secret jutsu are now useless and the best tactic is to get in close and combo away just be ready to dodge away when he charges and leaps. Remove another 2 bars of health to break the awakening and start the QTE.
QTE map -
(1) to tag in Suigetsu, then
(2) for Juugo.
(3) for Amaterasu
,
,
(4-6) to dodge the vines
(7) charge chakra
mash
twice (8,9) for the attacks
36 stars available, 33 required for S rank