Obviously it's a Harem Isekai LitRPG GL Gender-Bender where the System is a networked hive-mind of Authors, each seeking to manipulate. lure and seduce the protagonist to read and favorite and rate competing bubble realities within the SHVerse -- by handing out OP level-ups, offering an endless harem, referencing major pop culture fandoms, etc.
But the dark side of the System subroutines retaliate, trapping the power-addled protagonist in less OP, ordinary slice-of-life bubble realities where bad things happen, girls reject the protagonist and he just has to get on with life, powers don't let you beat everything, you have to grow as a person, blah blah blah
The ending is a massive cross-genre version of the final act of Evangelion (both versions) starring Reader-Shinji and starring Tony as Gendo