A 15-year-old candy shop heir finds a giant robot in his basement and has to save Kyoto before it turns into a crater. That's not setup for a serious mecha show, it's the joke, and the show knows exactly how funny it is. Doamaiger D treats its ridiculous premise with complete earnestness, turning every giant monster fight into a collision between "protect the family business" and "giant robots exist now." The real heart isn't the combat. It's a kid trying to keep his inheritance standing while defending his city with something he didn't ask for and barely understands. That tension between the mundane and the absurd is what makes this work.

Daijirou Kyougoku is the fifteenth-generation owner of Amashoudou, a traditional sweets shop in Kyoto. One day he discovers a giant robot called Doamaiger D sitting in the shop's basement. At the same moment, mechanical monsters known as Mekaijuu, a name that blends mecha and kaiju, appear in Kyoto and start causing chaos. The city needs a hero, and the one it gets is a robot with a connection to candy making. What follows is a retro-flavored short series that mixes action, comedy and giant robots with its sweet shop setting.