The Sekimeiya: Spun Glass (2021)

The tower mystery's explanations and ending belong to the standalone purchase, making this a strong choice for a reader ready to work through one elaborate puzzle. Its English script is the original language version. Built-in notes and text search help compare what people said at different points, but the information density remains demanding. Read it when you want a long, tightly connected mystery and can tolerate substantial analysis before its answers settle.