One day, Katsuyoshi noticed an unfamiliar app on his smartphone. The app was called— Common Sense Alteration ♡ You Can Do Anything~ ♡

Out of curiosity, he opened the app. It looked like an ordinary email screen. But strangely, it listed the names of people he knew and people he'd never met, and at the very top was "The World." At the edge of the screen there was an item labeled "Instructions." When he tapped it, {App Instructions} 1. Select the person—or the world—whose common sense you wish to alter. 2. Write the details of the alteration in the input field. 3. Press the confirm button to complete the alteration.