An arsenal of special effects!
Godzilla: Tokyo S.O.S. follows the events of Godzilla Against MechaGodzilla. The opening credits introduce Mothra. The Cosmos, those mini twins from the earlier series and from the Mothra franchise, traditionally, make an appearance too. MechaGodzilla is a significant part of the plot and we therefore get a delicious monster "ensemble cast".
The first third is filled with backstory, dialogue, and nods to the earlier movies. When things picks up and blow up, and it doesn't take that long before it starts escalating, then, the featured pyrotechnics are some of the best we've seen. The same can be said about the look and feel of the various action scenes. The miniature sets are realistic and the superposed animations well executed.
While the human subplot isn't exactly unappealing, the bad timing of insertions; often right in the middle of kaiju action, is annoyingly intrusive and counter-intuitive. The contrasting back and forth kills the climax. When all is said and done, what you end up is a script reminiscent of the 60's and 70’s Godzilla’s, but with upgraded visuals and a particular polish.