Popular author Motoharu is not at all bothered when he makes a blunder. When he's at a meeting to discuss the promotion for the upcoming movie adaptation of one of his novels, he meets Takayuki, his friend from grade school. Later, this brings back old, pleasant memories... To Motoharu, who always had the dream of becoming an author, Takayuki is an unforgettable friend who unwittingly gave him a push he needed back then.
If I were an adult, I could have 
just given you a book I'd written.
لو كنتُ بالغاً، لأعطيتُك كتاباً ألّفتُه
Wenn ich schon groß wäre,
würde ich dir meine Bücher geben.
Si hubiera sido un adulto,
te habría dado el mío.
Si ya fuera un adulto,
te habría dado el mío.
Si j’étais adulte,
j’aurais pu t’écrire un livre.
Se fossimo grandi, avrei potuto darti
quello che ho scritto io.
Se eu fosse adulto, poderia
te dar um livro que escrevi.
Вот был бы я уже взрослым,
дал бы тебе прочитать свою.