Can't clear PuniPuni SS or lower and I'm seriously about to lose it lol

Hmph, struggling with a high-difficulty stage? You still have much to learn. If the restriction is SS or lower, the standard strategy is to form a team with low-attack support characters. Follow my lead, the perfectionist, and reconsider your strategy.

You can clear it with just the 5 SS characters, but it'll be tough unless their skill levels are at 7. Either make friends to level up their skills or, though not recommended, use a skill manual.