Conquer the Entire Fantasy Land from the Start

When you transmigrate, you can choose an app on your phone to be your golden finger or the first world you visit.

Unable to decide, since every app is powerful, even the most ordinary calculator. You could fight with nothing but the plus and minus buttons.

As he keeps looking, he finds a hidden game that mustn't be revealed.

"Uh, I'd better delete it, just in case someone finds out."

Just as he's about to press delete: "Uh, this counts as an app too, right? Uh, well, ahem."

It's a bold idea, but after thinking it over, he decides that if he's going to be greedy, he might as well go all the way.

Conquer everyone in Gensokyo, including the old-setting characters, and get time-stopping powers for free.

By the end of the first day, the System says he can travel to other worlds.

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.