Seishun Buta Yarou wa Randoseru Girl no Yume wo Minai
English name: Rascal Does Not Dream of a Knapsack Kid
Genres: Drama, Romance, Supernatural
Type: Movie, Episodes: 1
Aired: Not available
Studio: CloverWorks
Source: Light novel
Rating: PG-13 - Teens 13 or older
Synopsis:
Finally, the day of Mai's high school graduation has arrived. While Sakuta eagerly waits for his girlfriend, an elementary schooler who looks exactly like her appears before him. Suspicious, and for all the wrong reasons... Meanwhile, Sakuta and Kaede's father suddenly calls, saying that their mother wants to see her daughter. She was hospitalized because Kaede's condition had been too much for her to bear, so what could she possibly want now? 

(Source: Yen Press)