Kodoku no Gourmet, Vol. 1

This manga simply describes how Gorou Inogashira, the main character, chooses and takes a meal. Unlike other gourmet manga, Gorou likes to eat at cheap restaurants and no trivia on cuisine is given. The authors are trying to depict the essentials of the act of "eating" by Gorou's monologue, which comprises most of the lines of this manga.

(Source: MyAnimeList)