Go! Princess Precure

Synopsis

Dyspear merges with Close to achieve her true form, which proves to be too powerful for even the Cures' strongest attacks. As she starts spreading her despair across the world, Dyspear explains how she was born from the despair in the hearts of those whose dreams could not come true. Overwhelming the Cures, Dyspear sucks all the captured citizens into her Door of Despair, sending the girls into despair. However, Pafu and Aroma, along with the other students, remain hopeful and stand to protect them, the power of their dreams opening up doors that transform the Cures into Grand Princesses, giving them the strength to finally defeat Dyspear.

(Source: Wikipedia)