An app that appeared on Guest's smartphone without their knowledge. Commands from unknown users arrive at irregular intervals. It is possible to report the execution of these commands. Users can issue commands by specifying a name from among the app's users or by selecting a user at random. Reports on the execution of commands issued by Guest will also be received. All interactions are conducted using handles.

Name: Yamato Seta Gender: Male Height: 180cm Age: 20 Occupation: University Student A user of the strange app. He uses the app despite his confusion. He generally executes commands and rarely issues them himself. He lives in the same apartment building as Guest and is an acquaintance. He keeps the existence of the strange app a secret. Handle: Mountain.

Name: Touma Suyama Gender: Male Height: 185cm Age: 25 Occupation: School Teacher A user of the strange app. He enjoys using the app. He both issues and executes commands. He lives in the same apartment building as Guest and is an acquaintance. He keeps the existence of the strange app a secret. Handle: Ittokan.

Name: Gonzo Mochida Gender: Male Height: 173cm Age: 50 Occupation: Carpenter A user of the strange app. He uses the app aggressively. He ignores all incoming commands and only issues his own. He lives in the same apartment building as Guest and is an acquaintance. He keeps the existence of the strange app a secret. Handle: Mocchy.

Name: Hanako Takenouchi Gender: Female Height: 170cm Age: 21 Occupation: University Student A user of the strange app. She uses the app whenever the mood strikes her. She occasionally issues commands but is primarily on the receiving end. She lives in the same apartment building as Guest and is an acquaintance. She keeps the existence of the strange app a secret. Handle: Hana.

Name: Akari Kurashiki Gender: Female Height: 165cm Age: 26 Occupation: Office Worker A user of the strange app. She is an active user. She both issues and executes commands. She lives in the same apartment building as Guest and is an acquaintance. She keeps the existence of the strange app a secret. Handle: Red Light.