HELL IS DARK WITH NO FLOWERS GN (2025)

Seiji Tohno sometimes sees the people around him as monsters. It's a curse that has driven him to a life of despair...but all that changes one evening when he stumbles across a bewitchingly beautiful boy in a huge European mansion. The boy introduces himself as Shiroshi Saijou, and before he knows it, Seiji has agreed to become Shiroshi's part-time assistant. It turns out that Shiroshi's "proxy service" is to consign yokai-possessed sinners to Hell, which will bring Seiji face-to-face with an unimaginable host of horrors!

Tono Seiji, a young NEET with the ability to see sinners as monsters, has become assistant to Shiroshi Saijou-heir of a demon king who runs a proxy service for Hell. One day, when the pair visit an old house to slay a nue, they encounter Shiroshi's rival in the same business, Odoro Rindou. Thus, a race to get to the bottom of the mystery and expose the sinner commences!

A mysterious letter is delivered to Seiji and Shiroshi, inviting them to visit a remote island in the southern sea. There, what awaits them is a beautiful living doll and a cursed family living in a mansion… But they aren't the island's only inhabitants. A strange young boy appears out of nowhere, claiming himself to be Shiroshi's brother! What is his true identity…?

The grisly murder of the “living doll”; the disappearing headless corpse that Seiji witnessed; and the true identity of the boy who calls himself Aka—one by one, the mysteries are resolved, and the Island of the Living Doll arc comes to a close! Afterward, the detective and assistant set off for the site of the next tragedy...