If this Harem Manga Ends, I'll Die!

Hero has been reborn as a side character in the infamous harem manga known as Harem, Harem Oval Crisis.
The only problem? Harem, Harem Oval Crisis was cancelled after just five chapters, and the troll of an author ended the series with a final confession...and his character’s grisly murder.
Join Hero as he tries to prevent that final confession, maintain the status quo, and keep the harem antics going, cause otherwise—
He’ll die.