The Amur Softshell Turtle (Pelodiscus maacki) looks very similar to the Chinese Softshell Turtle (Pelodiscus sinensis).
The difference is in the shape of the shield. If the shield is more flattened near the edges it is P. maacki.
Top, Left & Middle: Maruyama Park, Kyoto, Japan, 1 October 2018
Right & Last: Ritsurin Garden, Takamatsu, Kagawa Prefecture, Japan, 5 October 2018