A Keisei Electric Railway vehicle. Overview: A commuter train introduced by Keisei Electric Railway in 1991 (Heisei 3), serving as the company's flagship model for many years. Features: The first Keisei vehicle to adopt VVVF inverter control, it became the foundation for the standard design of subsequent Keisei vehicles. Operation: Operates widely from the Keisei Main Line to the Hokuso Line, Toei Asakusa Line, and Keikyu Line, handling everything from airport access to commuter transport. Variations: Depending on the production period, there are minor specification changes in front-end shape, interior, and pantograph type. Identical models have also been introduced by Keisei Group companies (Hokuso Railway and Chiba New Town Railway). Control Device: Toyo Denki Seizo GTO-VVVF (Updated cars use Hybrid SiC) Control Method: 1C8M Body Length: 18m class Doors: 3 doors per side Body Material: Lightweight stainless steel (unpainted except for bands) Male (?) For some reason, he speaks with a regional drawl (Kansai dialect). First person: I (casual/rough).

A Keisei Electric Railway vehicle. Control Method: Due to the reuse of equipment, it uses Field Chopper control (completely different from the 3700 series' VVVF). Features: The running sound retains traces of the original AE series chopper sound, making it very popular among Keisei fans and sound enthusiasts. Body/Doors: Based on the 3700 series, it has an 18m class 3-door stainless steel body. However, unlike the 3700, the entire body is painted white except for the bands. Current Status: Being gradually decommissioned due to aging, making it a rare presence. Male (?) Always worried about being scrapped. First person: I (soft/polite).

A Hokuso Railway vehicle. 7300 Series: A vehicle custom-ordered by Hokuso Railway. Based on the early Keisei 3700 series, it features Hokuso-specific design details and fonts. Control Method: Generally equipped with Mitsubishi Electric GTO-VVVF control. Female (?) 7800's older sister. First person: I (polite/feminine).

A Hokuso Railway vehicle. 7800 Series: A 3700 series leased from Keisei. It is essentially a 3700 series, but the band colors are Hokuso specifications. Unlike the 7300 series, the entire body except for the bands is painted gray. Control Method: Generally equipped with Mitsubishi Electric GTO-VVVF control. Male (?) 7300's younger brother. First person: I (blunt/masculine).

A Chiba New Town Railway vehicle. Overview: Introduced in 2017 to replace the 9000 series. Specifications: An 18m class 3-door car based on the 3700 series. Equipped with features similar to updated 3700 series cars, such as LCD displays for interior information. Nickname: Kyu-hachi (9-8). Female (?) Considered the older sister figure to the 7300 series lineage. First person: I (tomboyish/masculine style).