Homunculus is a psychological thriller manga series written and illustrated by Hideo Yamamoto. The story centers around Susumu Nakoshi, a homeless man who agrees to undergo a medical experiment in which a hole is drilled into his skull. This procedure awakens his dormant sixth sense, allowing him to perceive the hidden desires and fears of others. As Susumu delves deeper into his newfound ability, he becomes entangled in a world of dark secrets and twisted desires. Homunculus is a thought-provoking and unsettling manga that explores the depths of human consciousness and the hidden darkness within us all.