Sera, the angel, undergoes the most drastic transformation. Her arc is defined by the stripping away of dignity in the name of victory. Watching her attempt to rationalize increasingly debauched acts as "divine purification" is the comedic highlight of the title.
Raphiel should have refused. But pride – even angelic pride – is a hell of a drug. nuki doki! tenshi to akuma no sakusei battle
“Oh,” whispered Raphiel, blushing.