The Challenger to Great Old Ones

A series of short stories based on the Cthulhu mythos.

Each volume has a subtitle:
Volume 1 - Lamia (ラミア)
Volume 2 - Dark Mermaid (ダーク・マーメイド)
Volume 3 - Last Creator (ラスト・クリエイター)
Volume 4 - Confusion (コンフュージョン)
Volume 5 - Re Birth (リ・バース)