System: Struggle Starting from the Parallel World

Before time travel, he was a good-for-nothing otaku. After traveling to the parallel world, he made up for his past regrets... Now that he has a system in this world, how should he choose? Be the king of soldiers? Be a hacker? Or continue to do what you have done in obscurity? Before time travel, he had been single and solo for thirty years, and he had grown old. After graduating from college, he worked as a housewife at home... Here the system assigned him one "difficult" task after another, and in the end... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.