He doesn't really commit to anything.
You have the plot where he goes to another planet to help them with the fertility issues. Fine, but then instead it just goes "welp, he's not the chosen one after all, his sperm doesn't work" and they send him back to Earth.
Your love interest doesn't matter much either, both Tani and Andrea don't do anything special that effects your journey, they're just more slampieces, yet we're supposed to believe they have more value to the MC than the other girls.
Nothing seems to actually matter on this journey.