Hacker in Town: Stealing the Protagonist’s Sister

An introverted orphan and a genius cybersecurity employee find himself in a romcom manga world as a 2nd-year high school student. He suffers the experience of being back to school again. Until he sees the protagonist's sister, falling for her at first sight. Well, too bad she's a Brocon.

Ironically, he also is an orphan in his second life, but the good news is: After searching around, it turned out the world is similar to his a few years prior. And less cyber secure... OK, way less secure. But he wouldn't do anything illegal now, would he? At least not in broad daylight. Maybe.

Follow the story of the main character as he experiences his first love, wastes money, and tries to get out of his shell. All while random (rich) people lose their money online... And maybe, just maybe, it turns out that he isn't quite an orphan.

Sincerely, Towering Goose... wait, this isn't a letter tho? (Psst: he gets a dog, now read it! (there's a cat too.))