https://ncode.syosetu.com/n3581fh/

This series is the odd one out of my recent reviews.  That is because it is a sci-fi story that contains a bit of Cowboy Bebop, a bit of Outlaw Star, and even a small dose of Tenchi Muyo(albeit a weak version with less mystic elements).  The protagonist, Hiro, wakes up in the cockpit of his ship Krishna from the game he had been playing for the past few years.  He has no memory of how it came to that, and his ship is floating around a random asteroid in a borderland star system of the Empire.

What starts as a simple journey to figure out what is going on quickly becomes a long story of him building a harem, getting rich by slaughtering space pirates, and an endless series of troubles that seem to come out of nowhere to haunt his journey.  The harem is somewhat of a slow-burn thing after the first two (Mimi and Elma) join him, as it is over a hundred chapters until more or added.  Hiro is something of a hot dog ace pilot, mostly because of his experiences in the game, which gives him a ridiculously wide amount of knowledge and combat experience dealing with various threats on a tactical and personal level.  

Most of the series isn't terribly serious, because Hiro keeps snapping flags that might have made it so and because the writer pulls his punches on the series' dark-side, only hinting at some of the darker things that Hiro and the others come into contact with or referring to them indirectly without details.  

Overall, this is a fun series to read, though I would call it a space adventure rather than a space opera.