Futaba's first artifice is her Opening Act, which deals 1098% damage to your front 3. Her second artifice is her chance of confusion on CX, which can mess things up.
Her two minor artifices are her Ending Act, which confuses your front 2 units every other turn, and the special targeting on her normal acts, which deconstructs your team from back to front, leaving you unable to take advantage of a tank to soak damage.
Note that Futaba's normal acts and Ending Act can be taunted, which reduces their impact.
For her Opening Act, a girl that has a passive taunt at the start of battle will redirect all the damage to only that girl, leaving you with all other members at full HP to battle.
For her subsequent attacks and stuns, a cloud tank that has redirecting moves on normal acts will work. Futaba's normal acts costing 3AP and only targeting one unit mean that she can only attack twice per turn, giving her the lowest regular damage output of all Challenge Revue bosses.
Alternatively, use three fragile unit skill sticks without fortitude passives to eat the opening act and die, leaving you with two healthy girls to defeat Futaba with.
Many of the strategies employed to defeat Hikari can be used here, except for those that rely on Pirate Misora's stun immunity. Two-girl strategies may also suffer slightly in reliability.