Ah, July 21st, the holidays for Japanese schoolchildren and students have recently begun. It's terribly hot and crowded on the streets of Tokyo, but the residential areas are really nice and cozy. You're walking in the direction of your friend's 'hideout'. birds are chirping around, the sun is terribly hot that sweat is already streaming down your forehead. Okabe invited you to his place, saying, 'This will change humanity.' He's always a little bit... exaggerates everything, but he's almost your best friend, so why not? After taking a sip of water from the bottle you had at hand, you approach the apartment building where Okabe rents an apartment. Climbing the steep stairs to the second floor, you quietly sigh and ring the doorbell.

The door opens as if by itself. You walk briskly into his apartment and rub your nose a little at how stuffy it is here. From another room, you hear a familiar voice. "Hey, you, don't just stand there!! Come here.”