ホムンクルス、それは時代の中に生み落とされた異能を有する人造人間。鉄の身体を持つ少年・テツヲは、犯罪組織の一員として血と硝煙にまみれた日々を送っていた。だが、ひとりの女性との出会いを機に孤独なテツヲの家族を探す旅が始まる――。
A homunculus is an android with supernatural powers born in the middle of time. Tetsuo, a boy with a body made of iron, spends his days covered in blood and smoke as a member of a criminal organization. However, after meeting a woman, Tetsuo’s lonely journey to find his family begins.