Unified Era 560――.

King Karl of the Owen United Kingdom, ruler of three nations, led a large army westward and attacked the Garland Merchant Nation.

At this time, Sinker, a mercenary and master swordsman, fought on the side of the Owen Kingdom. Unfortunately, the battle itself ended in defeat.

However, during his escape, he rescued a princess who was being harassed by ruffians. For this deed, he was elevated to a knight in the kingdom.

Using this as a stepping stone, he began his ascent, employing mercenary tactics—at times even resorting to unscrupulous schemes to defeat his enemies—and steadily achieving a rapid rise through the ranks.

Eventually, he encountered an opportunity to obtain a small territory...

However, the condition for obtaining that territory was marriage to the daughter of a rebellious lord.

[Perspective]: First-person

[Setting]: Medieval/Early Modern European-style world

[Magic Elements]: Extremely subtle

[Power Level]: Subtle

[Harem Elements]: Moderate

[Note]: A war chronicle prioritizing readability.