Anohana: The Flower We Saw That Day (2011)

Six childhood friends have grown apart over the years following the death of one of them, Menma. The original 'leader' of this friend group, Jintan, is currently aimless in life and it is at this point in his life that he starts to see Menma's spirit. She states that he may be able to see her because of a wish she would like fulfilled but is unsure of what that may be. Due to Menma spurring Jintan into action, we will see the various paths the members of the friend group have taken over the years as they have matured, as he attempts to fulfill her last wish.