How am I supposed to believe that? I think the best time was when he was an operative — there was flirting, there was lots of delicious food, there were battles with demons. How could the best time be when he was eating garbage as a homeless person? That's nonsense.
The fights are interesting and all that, but I'm dying to see some kind of global development. Is he going to fight endlessly as a slave? With such a harem, they could have just fled to another country, or is there a legal way to get out? The original villain lost everything and we don't see her...
It's more creepy than hot.
Overall, it looks like pussy move - the author showed how Agawa sucked off the teacher, and then he deletes/rolls it back and makes the protagonist a whole harem - adding one girl after another... Even Agava sleeps with girls now, not boys. It's as if the author is...
The novel is trash. Every girl offers herself to him AFTER THE FIRST MEETING. Every single one (they're all brainless). The author creates some crazy situations on the fly — like a random boss with a 1% chance of appearing that you can only beat in a new game+ if you have everything you need...