Hakai Me no Yuuri - Chapter 16: Let’s Make a Weapon

A naturally timid engineering student found himself transported to France before the grand revolution, only to become the older brother of the future Emperor Napoleon for some inexplicable reason. Now, he faced a crucial decision: would he seize this opportunity to create his own remarkable destiny or merely cling to this lifeline and drift along?

Chi Lang transmigrated to the Middle Ages as a third-rate magician in a third-rate magic academy. His magical aptitude is zero. But he has a good roommate.

His roommate is good-looking.

His roommate is good-natured.

His roommate helped him escape from danger several times.

His roommate never complains.

Chi Lang felt like he liked his roommate a little bit, and then his roommate helped him solve his ‘single’ problem.

It wasn’t until much later that he realized that his roommate was a remarkable figure.

——He was one of the demons sealed by the magician known as the “God of Magic”… And Chi Lang became the one who unlocked the seal of the Demon Lord.

- Description from Novelupdates

Starting from Hunter, Becoming a God at Level 100At level one, each attribute point increases by 1; at level two, each attribute point increases by 2; at level three, by 4…and at level ten, by 512.With every level, all attributes double. But at level 100, will he still be human?Lorraine wakes up to find himself transported into the world of Hunter x Hunter.Good news: he’s crossed over!Bad news: it’s a complete immersion.Good news: he has a system!Bad news: leveling up requires physical training.Good news: the system is powerful! Each level doubles his attributes, and at level 100, he’s granted godhood!Bad news: with each level, the experience needed also doubles.Thus, in the boundless worlds of existence, Lorraine embarks on his endless path to ascension.

It’s a story about a man who got transported into a novel and possessed a slum boy. He met a noble girl and served her as a butler for 13 Years. Now the girl has already fallen from her noble life and lives in an abandoned mansion with paralyzed legs. Why did she become like that? Of course because she is the villainess in the novel.