Reincarnate into the Game World! Why Does This Person Look so Familiar?

It is an adventure game about being reincarnated into another world. I originally thought that cheating in life would make it easy to defeat monsters and upgrade. Unexpectedly, at the beginning of the chapter, the system prompted me to lose key memories, and the initial mission I received turned out to be extremely strange—— Rescue the princess who was kidnapped by the devil, but the princess's true identity is actually my classmate in the real world? At the same time, the mysterious guide secretly informed: There is a shocking truth hidden in this game world...