Or instead of doing all the things Quall suggested you could do like this,
1 .unpack the ISO
2. look in the movies folder and remove all videofiles that ends with "j".
there a filename.movie and filenamej.movie files (not named filename and not ending with movie!). Remove those with the "j" and you won't have any japanese movies left. The english ones will still be there.
3. After deleting the jap movies you will also need to delete the doa4.sfd video and then make a copy of the d_aruma.sfd and rename it to doa4.sfd and place it back into the directory. you wont have the doa4 video anymore in the game instead the d_aruma.sfd video will play in its place.
4. if it still does not fit you can also remove these files,
dashupdate.xbe
update.xbe
5.enjoy a dvd5 version with only a doa4 preview video missing
total size after fixing 4.39gb