Review Detail of Austin_B_1332 in Assassination Through the Netherworld

I have enjoyed the story a lot. Everything flows well and is easy to read. One thing I'm confused about is how the characters get stronger. I don't know if I'm missing something or if it just hasn't been revealed yet. I also hope that this doesn't become a harem. I don't want to see the mc with a bunch of girls. Overall the story is well written and I would highly recommend it.