"Why can the doctor command immediately upon waking up?!" "Because he was once stationed in the Intercity." "Why does he know so much about firearms?!" "Because he had a broken nose." "Why can he use magic when he's not a magician?!" "Because he witnessed the freezing of humanity." "Why do we feel so familiar even though we've never met?!" "Because it's a long-awaited reunion." "Then why did he run away?!" "Because I'm not going to be the Doctor's Master/Commander anymore!" PS1: Crossover anime, Infinite, No Game No Life Zero starts here, see the volume title for the rest. PS2: Just so you know, there are absolutely no yanderes this time!