When I first saw the transferring to another hospital with a poor condition in D-Day I immediately remembered RDTK. Although it won't be the focus in D-Day, I can still see the resemblance especially how the lights get turned off in the hospital. The dramatic accidents are very similar to those in RDTK because they have a similar feel. D-Day is based on Disaster genre, so there is more of that there. And they both have light romance that develop slowly.