One day, I lost something very dear to me.
A collection of cherished portraits, photographed at various cosplay conventions―in an unfortunate accident, the digital camera with all that data goes kaput.
Witnessing the tragedy, sisters Yua Yamakake and Sana Yamakake say to console me as I wail in sorrow…

“…How about you take some cosplay photos of us?”

I accept. I readily accept.
These sisters are offering to become my very own cosplay models!
Amassing every skill I honed as a dressmaking student and a doll costume designer by passion, I make it my duty to create cosplay outfits for the two.

And as I begin to pick up speed, I get another lucky break.
In a peculiar turn of events, I’m given a ticket to Costalia, an island resort for all things cosplay.
There, I’m certain I’ll snap the greatest photo there ever is.
…What I don’t know is that what awaits me on the island far exceeds my expectations.