SUMMERTIME RENDERING 2026: THE ROOM THAT DREAMS OF MURDER

The novelist Ryunosuke Nagumo is apartment hunting with her niece, who's been accepted into Tokyo University. They happen upon a large aparment for cheap—except, it's haunted! A suspenseful spin-off set in the future of Summertime Rendering. (Source: MANGA Plus) — Description from AniList community (anilist.co).