Yotsutsuji no Bishounen

A handsome, black-clothed man who wanders the streets searching for girls playing intersection fortune telling. He has an unnatural influence on any girl that asks him a question, causing them to follow his advice without question and later to kill themselves out of despair. Girls that meet him also tell their friends about him obsessively, causing more girls to become curious about him.

(Source: Itou Junji Wiki)