Metamanga. 
The audience also involved in this gacha by waiting for a HEAVENLY story, and when they do not get what they want, they react by blaming ONE of the story involved. Just like a real gatcha.
Interesting manga about how trash the protag, then the reader try to imitate the trashness of the protag by dropping it by a single chapter.  They afraid to face themselves it seems. 
And the rest, who are still reading, are still playing with the gacha, reading the manga.