After Passing Through the Book, I Have to Save My Bestie

Wake up and find yourself in a different world? With the memory of the original owner, I was surprised to find that the characters here highly overlap with the novels I read! Don't panic, I'm a little transparent who doesn't have much contact with the protagonist! Wait... Why is my best friend wearing it too? She also became the cannon fodder female supporting character who received the lunch box! Don't worry, Turtle, wait for me to save you!