人魚の森 [Ningyo No Mori / Mermaid Forest]

Rumiko Takahashi's chilling fantasy-horror series, Ningyo no Mori (Mermaid Forest), began its run at Shogakukan in 1988 and remains an ongoing, single-issue work. It follows the immortal Yuta and his companion Mana as they search for a way to regain their mortality, encountering other beings who have consumed mermaid flesh and the grotesque, often tragic consequences that follow. This series stands as a darker, more contemplative counterpart to Takahashi's better-known comedies, exploring themes of immortality and isolation with a haunting, folkloric touch.