I get that the 'Strategy' notebook has a spiral/flower image on the cover, but I find it funnier to think that [chaotic vortex creation] was the actual strategy.
@justforthelulz Actually, I don't think it's on the cover. The spiral flower ("hanamaru") is a mark that is equivalent to a gold star, A+, or perfect score. Ijuuin's strategy is a hanamaru = Ijuuin's plan for victory is perfection. Or, if you want to view it as a grade of the outcome rather than as the plan itself, their strategy was 100% successful.