It focuses on the main character, Nakahara Daisuke, as he eats ekiben, bento meals sold at train stations, as he travels around Japan by rail.
[1] Nakahara Daisuke is the owner of a bento shop in Tokyo and a densha otaku.
Although the trip is intended to be a solo one, Daisuke often befriends other travellers along the way and shares information about trains, railway history, ekiben, meibutsu, and local landmarks.
[2] At each stop Daisuke or one of his fellow travellers buys an eki-bento (ekiben), and one full page is devoted to an image of the just-opened container with all components labelled; subsequent frames highlight the history and flavors.
[3] In order of appearance: Each volume of the manga focuses on a different region of Japan as Daisuke travels from station to station, viewing the local sights and eating tokusanhin in famous ekiben.