Seraph of the End (2015)

S1E14 Scroll 14: The Crybaby and Candies

Chuuzubo calls his ally Chuunin down to Earth, where the two quickly turn Yousuke and the others back into children. Chuunin believes their newfound vulnerability will be the perfect opening to finally destroy the planet, and the team must scramble to find a way to reverse the spell before it's too late.