Inspiring Me to Become an S-Class Valkyrie

My father once said that we should use magic to defeat magic. A book I picked up from the sewer completely brought me to the top of my life, but this book of mine is so unorthodox. It contains all kinds of sand sculpture magic and monsters. This book also went to the collapse world because of this book. Alas, since I am here, I will change this imperfect world and turn it into what we expect. By the way, I will open a harem. Hehe, I am a cute new author. Because I am still a student, the novel is updated from time to time. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.