Double post because Rashomon Time!!!!!!
If this is your first time bullying the banana, here's some information on the Raid.
THIS RAID DOES NOT CONSUME AP. REMEMBER TO USE YOUR AP.
You will be facing first a wave of weak enemies (grind NP off of them!), then the oni herself. Ibaraki is always a Berserker, but her two adds - her arms - are a Day-dependent Class; today is Archer, for example, and Day 7 will be Berserker. Note that while their charge gauges and NPs are always the same, their general strategy, buffs, and turn order are all variable depending on the Day.
Ibaraki's NP deals damage, dispels buffs, and inflicts Defense Down - in that order, on a single target - so while Guts is no good, Evade/Invincibility can tank it easily. Note that it will shear off Taunt, which may throw some strategies out of whack.
Left Arm's NP deals damage to and stuns a single target. It's a three-turn NP, so have some way of dealing with it.
Right Arm's NP deals damage to and skill seals everyone. It's relatively weak damage-wise, but it's probably a good idea to make sure that seal isn't going to screw you over.
You have 15 turns to do as much as you can to the oni; die, kill, or survive to add any damage you've dealt to her onto the pile.
There are two major Event CEs; The Wandering Tales of Shana-Oh, available in the shop, give one character a powerful Attack buff; while Golden Captures the Carp, available in the damage ladder, gives the entire party a good Attack buff.
Since there's only one shop currency, all the Gacha CEs increase the amount of it you get.
If you need currency fast, kill the hands before you end a raid battle. If you want to survive as long as possible, avoid attacking the hands at all. You don't want Ibaraki bicycle kicking two people in the head every turn unless she's already about to go down.