ダイサギ
3 sightings
It looks quite similar to the Little egret - the easiest differentiator is its size. It also has a yellow beak and black legs.
To make things more confusing, there is also a Medium egret which I haven’t had the pleasure of spotting yet. The main differentiator according to this post seems to be whether the yellow/green beak extends beyond its eyeball or not.
Enjoying its lunch.
Spotted fishing in the distance from the bridge over the Tama River on the walk back to Ome station.