Somewhere in a slightly different world line is the dimension known as Gamindustri. Neptune and her fellow goddess candidates are studying abroad at a human school to understand and learn about the humans they are protecting. A trial was given to Neptune, who had been spending every day lazily as peaceful days go by. The challenge is... to create a game?! (Source: Kadokawa, translated)

Yuuma Yamabuki has just moved to a new town where he meets Laira, a cross-dressing boy who asks for Yuuma's help. Yuuma must cross-dress to follow Laira back to his all-girl school where he meets the others in the Girl Research Society.