So did Fuji erupt at some point.? I read once that Fuji's next eruption might be rather like St Helens's, which certainly would effect the silhouette quite a bit.
Events that have happened:
1. Global warming (rising sea levels). Old cities being abandoned.
2. Tokyo no longer being the capital. New capital left unspecified.
3. Mysterious airplane circling the earth. New species spotted (Misago).
4. Mt. Fuji's volcanic explosion