David encounters a magical system.
System: This person doesn't know how to behave.
David: Oh.
System: What a coincidence, this person is also named David.
David: Oh.
System: You teach him how to behave.
David: ... Wait, is there any necessary connection between these?
Then David went to teach David how to be a man.
David: Wait! Why is there always a guy named Lu Yi?
Lu Yi: If you do it, then there will be people.
David: ... Take your hands away!
It all started from a bet with the devil.
As a human being and as a demon, I belong to you.