Volume 1
Volume 1 is about Ii-chan (the unnamed narrator) visiting a remote island with geniuses, where a locked-room murder occurs, forcing them to uncover a killer amidst intellectual clashes; the series follows this cynical protagonist through various mysteries, revealing his unique ability to discern truth from lies, though he often feels his actions are meaningless in the grand scheme.
01. The third day
On the third day of the narrator Ii’s stay on Wet Crow's Feather Island, the story focuses on interactions between the various geniuses and guests, leading up to a dinner where all twelve residents gather. No major crime or murder occurs on this specific day; the events are primarily character-driven and build the setting for the subsequent mystery.
02. The fourth day
the central murder mystery dramatically escalates, leading to the discovery of a second victim
03. The fifth day
the story deals with the aftermath and investigation of the second murder victim, Akane Sonoyama, who was found decapitated in a supposedly locked storage room