Not a fish, but a fish that improves its status/rises in the world

"Takahara Province Kuroda Castle Detachment, Miscellaneous Soldier Small-Time Rank, Ichiro!" ■Before I knew it, I, Matsuura Ichiro, had been transported to a Japanese-style alternate world called "Yamato" where feudal lords govern territories, samurai hunt monsters, and Shinto priests use magic. Ever since arriving here, for some reason I've been able to produce extraordinary power—I can easily dispatch small demons and masterless samurai with one hand! One day, after helping a princess from the capital, I found myself advancing down a turbulent path to success, but... at this point, I have no choice but to steel my resolve and charge forward! ■Heavenly dragons, demonic spirits, land deities, court nobles, ninja, and princesses—a fake-and-quasi Japanese-style rags-to-riches fantasy with everything included, now begins!