Shibuya/Tokyo Metro

The Tokyo Metro (東京メトロ) is the primary railway transit system used in Tokyo, and by extension Shibuya. Shibuya Station and all of the adjacent subway stations connected by the Tokyo Metro serve as some of the primary settings of the Shibuya Incident Arc.

Description
The thousands of citizens of Shibuya generally travel using the main railway system; the Tokyo Metro. Shibuya Station is directly connected to four adjacent stations outside the main city area: Meiji-Jingumae, Omotesando, Dakan-Yama, and Ikejiri-Ohashi. This allows Shibuya's pedestrians easy access to places like Tokyo City, Shinjuku, Harajuku, and various others.

Subway stations are generally divided into five basement floors labeled "BF" (i.e. Basement Floor 5 is shortened to B5F). All of the subway platforms are stationed on the basement floor B5F of their respective building. For example, the Meiji-Jingumae Sation is connected to Shibuya Station via the B5F Fukushotin Line. Someone can board that train to Shibuya and reach their destination in just a few minutes.

This railway played into Pseudo Geto's plans for the Shibuya Incident. Several stations were strategically hit and flooded with transfigured humans. Then Mahito moved a large amount of them to Satoru's position using the trains.

Following Satoru's sealing, Mechamaru's plan to rescue him required sending teams of sorcerers to attack Shibuya Station from the adjacent stations. Mei Mei traversed along the tracks between Meiji-Jingumae and Shibuya stations while other teams entered Shibuya Station from above ground and made their way to the lower floors.

Trivia

 * The Ginza Line is also a subway line adjacent to the Fukutoshin Line, but it's route to Shibuya Station is above ground, so Gege Akutami decided not to include it in the story.