Review Detail of Hunab_ku in Summoned (Hotd) highschool of the dead

This sounds like a translation of a Chinese novel. Also the protagonist is either the author who is sorry for the envy he has that someone has a girlfriend or stays with several while he has nothing. also by getting women to change that love for him. Why it's hard for authors not to leave the girls. The protagonist always wants to replace the one that women are going to have.