Jagged Germany - Chapter 12: New battleship (for collection)

Kanda Kyoichi transmigrated to Konoha and became a temporary instructor at the Ninja Academy. Fortunately, he awakened the Mentor System.By teaching others, he could earn rewards.Thus began Kyoichi’s career as a “teacher” in the ninja world.Shisui: “Sensei’s unique interpretation of the Will of Fire has given the Uchiha Clan a true sense of direction!”Asuma: “The essence of the jade lies in protecting the people, with the advanced leading the way for the less experienced. Only then can Konoha become stronger!”Kakashi: “He’s my life mentor. He transformed Konoha!”...Years later, in the memoirs of Kyoichi, now the Hokage, he wrote:“I honestly just wanted to be a life mentor!”

The Coinbound System lets him buy spells, skills, and stat boosts like a magical vending machine...But nothing comes free.Every fireball costs gold.Every body enhancement? Taxed.Even getting a suggestion comes with a convenience fee.While nobles train for years to master a single flame spell, he can just buy it off the System. From summoning spirit beasts to crafting forbidden runes, his power grows with every coin he scrapes together… and every unnecessary expense he dodges.But in a world where magic is passed down through noble bloodlines and ancient family grimoires, a broke outsider with a price tag on every spell has no business rising through the ranks.Still, he’s surviving. Thriving, even.So long as he tracks every copper and refuses to overspend on fireballs, he just might make it out alive.They call him cheap.They call him stingy.But one day… they’ll all remember the name:The Frugal Mage.

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates

「Shimizu-san, you dyed your hair black.」「Ah, yes.」「Why did you dye it all of a sudden?」「Because…yesterday…」Shimizu-san, who sat next to me and had dyed her hair from blonde to black gradually lowered her voice, slightly blushed, and laid her face down on the desk.