"Even a Chance Acquaintance is Decreed by Destiny" is the first episode of Durarara!!x2 Ketsu and the fifty-third episode overall of the Durarara!! anime.
... Durarara!!x2 Ketsu and the sixty-first episode overall of the Durarara!! anime. As ... x2 Ketsu and the sixty-first episode overall of the Durarara!! ... Ketsu 1.