Moto Sekai Ichi'i no Sub-chara Ikusei Nikki - Chapter 87: Damage, Salt and Pepper.

After being transported to this world, Nara Kazuki discovered that as long as he grinded enough proficiency, his jutsu could level up.And so, he began walking a very... peculiar ninja path.

“Here you go, this is your wage for the week.”After passing over a small pouch, the woman with her legs crossed behind the desk casually made a 'Check' in a notebook and then, without looking up, waved her hand to dismiss him and said:“Remember to file your taxes... Next!”“Wait a minute!”After pouring out the coins from the pouch and looking at the eight large and one small, totaling nine filthy coins in his palm, Leon couldn't help but widen his eyes in shock, almost wanting to pounce on her and fight to the death right there and then.“Damn it! I just repelled the evil god who was trying to erode the world this Tuesday! You bastard even wants to deduct the salary of the savior?”

Survival is easy. Life is very difficult. My family wants not to live in humility, but to live a proud and glorious life. My family, will not be slaves!

- Description from Novelupdates

Reborn as a sword, he lived for hundreds of years, and then he occupied the body of a 15-year-old prince.