About I Am a Magical Girl with Twin Bodies

My name is Ning Hai, a qualified two-dimensional high school student... In this world I live in, there are monsters and guys who suck human blood everywhere... It's a sinful world anyway. However, there is still "justice" to safeguard this world. They are called magical girls, and they are a group of magical guys. They are all beautiful, can use magic, can fly, and have the power to destroy heaven and earth... What, I am also a magical girl? Is there another personality in my body? Whenever I encounter danger, another personality will run out, and then I will become a magical girl? Everything starts from that hot summer day...