^ Sokhar san, thanks for that post.....
Here is a trailer from 「終焉少女 Last Girl Standing」 / 'Shūen Shōjo Last Girl Standing'
Director is Kentaro Yamagishi.
Other than Naomi and Natsumi, the film also roles played by former Idoling!! member Suzuka Morita, and current members Hitomi Miyake and Karen Ishida, and several gravure models.