What to Do? I Picked up a Little Devil

I, Lu Heng, picked up a little devil loli on a rainy day. She has pink hair and wears strange cosplay-style clothing. The face is petite and exquisite, with a pair of pointed little ears under the bright black eyes. But the most surprising thing is that she has half a black wing on her back. The guy who calls himself Little Devil says he is homeless, I had no choice but to take her in and live at home. She eats my snacks, watches my TV, and sleeps in my bed. You still have to quarrel with me every day. . . . "Have you ever eaten braised chicken wings?" "I am a devil, little devil Xi Ling." "I want you to know how scary the devil is!" "The devil can't save people, it's only good at giving people despair!". . . . A few days later, another beautiful blonde who called herself an angel came to my house. And according to the angel, I seem to have the potential to become a "savior" or a "big devil"...