Ao Haru Ride: Unwritten(4417)

Other Title(s)Ao Haru Ride Prologue, Ao Haru Ride OVA, Blue Spring Ride OVA, Aoharaido OVA
アオハライド unwritten
Genre(s)Romance, School, Shoujo, Slice of Life
SynopsisBundled with the 11th volume of the Ao Haru Ride manga.

Episode about Futaba and Kou in middle school. Based on the chapter called 'Unwritten.' also known as chapter 0 or Prologue.

(Source: sakisaka10)