Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 737 - 736: Crisis

When he was engrossed in the Wizard World, Roger unexpectedly transmigrated to a world that seemed familiar yet strange.In this place, the legendary monsters actually existed, disguising themselves among the populace and becoming a part of this world.Starting from a deserted island, Roger began his career as a Demon Hunter.Although he had an inborn golden touch after transmigrating, what made him somewhat helpless was that it wasn't him with the cheat, but rather just a dilapidated house ready to collapse...After a long time, when Roger ascended to the castle surrounded by mountain peaks,he couldn't help but let out a sincere exclamation:“From a cabin to a castle, the house is too big and hard to manage!”…………This is the story of a Demonic Hunter living in the modern world.

He was the continent’s strongest and most revered alchemist, Ye Zifeng. He was under one person and above millions. However, due to an unpredictable event, he had died. After his rebirth, he had become the supertrash of the Ye family and suffered disgrace. To make matters worse, he had an argument with his fiancé that led to the break off of his engagement. In this second life, he will work to change his own destiny. He vows to return to the peak of the world, trample on those who laughed at him and rewrite his legacy!

- Description from Novelupdates

In the autumn of his second year of high school, Tsujidou Masachika had just been appointed as the student council president when he found himself helping a student who was suspected of smoking in school.Her name was Ooba Monaka, a junior gal rumored to be a beautiful girl.He helped her on a whim, with no intention of getting involved. At least, that’s what he thought until…“I’ll do anything to thank you, Senpai~”For some reason, she became extremely attached to him!She would barge into the Student Council room every day, help with event preparations, and even go on dates. Gradually, Masachika and Monaka get closer as she aggressively narrows the distance between them.In the midst of it all, it turned out that the ‘suspected of smoking’ accusation was actually due to malice…?A sweet romantic comedy with a cheeky and cute junior gal begins!