QUICK SPOILER FREE REVIEW:
If you think this will be some extreme glow up and romance hijinks, it's not, at least not yet. It's a competently told story about a salaryman who is trying to redo his life when he unexplainably goes back to his high school days. He uses the lessons he learned as a hardworking employee but this time without the shackles of adult responsibility. No fights. It doesn't dwell too much on the romance aspect, but it's there in light touches. The MC would be an ideal medium for self-inserting except he actually has personality here, albeit not that much.