I Beg the Male Protagonist to Be a Sigma Man, Unmoved by the Girl's Crush on Him

I want to read a book similar to "Nisgaru: My Daily Life of Exorcizing Souls in Tokyo (Nisgaru: Source Story)". Either a harem or pure love is fine, but don't write a pseudo-harem in the name of pure love, or a pseudo-pure love in the name of a harem. You must be able to combine the girl's shyness and emotional changes.