Before we witness the seriesโ climactic showdown in the third volume of the "End Tale"โeach part of which forms its own cohesive wholeโnarrator Araragi wrestles with a crucial bit of history that had turned him into the loner we met at the very beginning, who opined that friendships only lowered his intensity as a human. What initiates his pilgrimโs progress of a reckoning is his first encounter, at school, with the mysterious freshman Ogi Oshino, self-described niece of the equally enigmatic aberration expert Mรจmรจ, and the bookโs opening chapter is a harrowing standalone novella of a whodunnit involving a locked room of sorts. Our increasingly well-adjusted hero kept on being decent at one thing even when he was just hanging on, but this forte, an unlikely aptitude for math, of all things, becomes the focus of a cheating scandal and a web of recollections that forces him to come to terms with, what do you know, his capacity to connect to people.