The Phone

The Phone is an item found behind the Hakurei Shrine in Gensokyo arena, it can't be picked up though. The Phone and the code is necessary to unlock the character Koishi Komeiji.

To unlock her, player must stand near The Phone. Once standing near the phone, they must type/spam a secret code. The code necessary for unlocking her can be found in this video: https://youtu.be/eHcHjcV8SNY Once you type in the code, you will be sent to a seperate game called Your Counsciousness. When joining the game, you must go close to the payphone, then you will get a screen showing Koishi's last words. If you get kicked, it means you got her.