For those who wanted to read this thinking that maybe it wouldn't be so bad—forget it.
MC - He does absolutely nothing throughout the story (and even less to lose weight; sorry, piggy, we've failed). He doesn't care about anything or anyone around him. The only thing he does is get aroused by the girls who are crazy about him (just like a standard harem MC from an isekai).
Side characters - unbearably boring. They either worship, praise, or are simply in love with the MC, or look at him like he's a fat loser who, for some reason, has it all (which is exactly right, but the author tries to portray them as an ununderstanding mob).
Plot - essentially nonexistent. The MC just gathers a harem while things happen around him.
Comparing this story to Piggy Duke is idiotic. Despite all its flaws, Piggy Duke is a world-class masterpiece in comparison to this shit (the standard love interest in Piggy Duke had more character than all the characters in this title).