tokyo_requiem
東京鎮魂歌 (トーキョー・レクイエム, Tokyo Requiem)
An adult comic book by Nakamura Nishiki. It was adapted into an OVA series.
Sodom no Shima, an eroge by M no Viilet, and this manga share the same universe.
Not to be confused with Shin Megami Tensei: Tokyo Requiem (a cellphone game) or Tokyo Requiem, a manga spin-off of Tokyo Majin Gakuen Kenpuuchou.