Doraemon: I have a book of Kuro's magic

Introduction: Cen Feng was accidentally reborn into the world of Doraemon, and received a Wanjie System on the day he transferred to school. Just sign in to get rewards from all realms. Eyes of God, elves, elemental magic... all of these can be obtained through signing. After receiving the reward, he suddenly saw a very familiar sealed book on his bookshelf when he returned home at night. Cen Feng fell into silence as he took out the familiar sealed book from the bookshelf. This is the world of Doraemon, right? So what's going on with this book? Even if you kill me, I won’t become a magical girl!