A Normally Dowdy Man Is In Essence The Mightiest War-God. (That Ordinary Mister is a War God)

[Bearingletters]

Publisher: Kadokawa Sneaker Bunko (Kadokawa)
Status: 4 Volumes (Ongoing)
Manga: Yes (1 Volume)
JP Title: 日常ではさえないただのおっさん、本当は地上最強の戦神

Summary: Bar, an ordinary middle-aged mister* and a veteran adventurer, lived an easy, comforting life in the Imperial Capital. He would carry items for adventuring parties or help the guild’s staff from time to time. “Mr. Bar, glad to have you today!” “Thank you for your words.” That uncle who was liked by everyone in the capital, was actually the strongest arsenal of the Empire–One of the “Laevateinn”–Bartolomeus. “Please step forward, Lord Bar.” With a delicate and beautiful elven girl, Welhe Mina, to back him up, his gallant figure racing across the battlefield or the political battleground was simply godly—like a War God.
The heroic tales of the dowdy adventurer AND the mightiest arsenal starts here!

*Mister – In asian countries, middle-aged men are usually called misters by younger people rather than by their names.
**Authors Note: This is the LN version. It has been changed drastically from the Web Novel, and also has a new heroine.