Tomodachi no Imouto ga Ore ni Dake Uzai - Volume 1, Chapter 2: Only my friend’s little sister’s older brother is kind to me

One of the top expert killers, tired of endless assassinations and having survived a cruel and suppressed life, decided to escape the world’s strictest assassin organization.

In the expansive expanse of existence, there exist realms concealed from the awareness of ordinary folk.Rain Weathers, an unremarkable teenager with average looks, physique, and grades, was leading an uneventful life.However, everything took a dramatic turn one fateful day when he found himself plunged into a vivid dream, a dream that unveiled a world beyond imagination — a world teeming with spirits, monsters, and conversing frogs.This was the Spirit Realm.Transformed into a player by the mysterious machinations of the universe, Rain, alongside other chosen individuals, found themselves thrust into a perilous world.They were tasked with navigating their newfound domain, establishing their territories, all while fending off relentless onslaughts from beasts, defending their territories from other races, and making sure to stay alive for another day.

A chance to change, to challenge destiny, making dreams a reality, and live a legend! A regular man gains a system that allows him to turn into a fish!

She shouldn’t have got drunk, so she wouldn’t have court the troubles.
She slept with a handsome man and would be sent to the police?
Oh, my sweet Jesus…
“So you just ran away like nothing happened after you slept with me?”
“Old jerk! Even if I had the initiative, it was you who took advantage of me!”
As a saying goes, the more spoiled a president gets, the more likely he becomes a scumbag.
An adorable ‘wildcat’ vs. a scheming frenemy.
This was a love rivalry between a modern Cinderella and a Big Boss.
As time flew, the world was like a fleeting show.
When they met again after several years of separation, he held her hand tightly and swore that he would never give her any chance to leave him again!
Finally, he asked her to marry him and pampered his cute wifey with his endless love.

- Description from Novelupdates