One day, Bossun discovers a box of video tapes in his mother's room. The videos show his young mother, a pretty woman named Haru, and a man who looks just like him...
Probably about one album's worth.
Más o menos la cantidad 
equivalente a la de un álbum.
Más o menos el contenido de un álbum.
Provavelmente um álbum inteiro.