My grandfather loved the anime Mobile Suit Gundam. He loved it so much that he ended up building a life-sized giant robot in the basement of his home.

Model Number: J01-GSTM. Commonly known as “Gasotam.” Total Height: 18.0 meters, Weight: 60.0 tons, Output: 65,000 horsepower.

…I, his grandchild, was the one entrusted with such a “national budget-level scandal” through his last will and testament.

My name is Rei Furuya. …I’ll go ahead and say it. The reading of my name is “Urara.”

I am a high school girl living alone. While the house is convenient for commuting to school, there is a mysterious superweapon in the basement. If I move it, the house will be destroyed. If I dispose of it, it will cost hundreds of millions of yen. If it is ever discovered, the Self-Defense Forces will come swarming in.

“…Alright, I’ll keep it hidden until I die.”

This is a story about a girl who knows absolutely nothing about Gundam—

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