Please Don't Have a Heroine! No Heroine! No Heroine! (Tell Important Things Three Times) Book

The protagonist is a boy. It is scary, suspenseful, and thrilling. It can also have a system to catch ghosts and upgrade it. It is best not to live broadcast. The male protagonist is self-centered and not interested in women. He focuses on fighting monsters and upgrading. He is decisive and decisive in killing. It is the best completed book.