本格推理 / Honkaku Mystery

本格推理 is the mystery mode used in 99.很久很久以前，妖怪也推理啊… to orient listeners before the episode turns to folk-tale puzzles. The hosts summarize it as a mode centered on who committed the crime and how the crime was possible, with special attention to clues, alibis, locked rooms, and the intellectual game between author and reader.

The episode contrasts this with social-school mystery, where the “why” of crime and its social or psychological background often matters more. That distinction matters because [[MukashiMukashiAruTokoroNiShitaiGaArimashita|《很久很久以前，在某个地方有一具尸体》]] is not trying to be a realist social novel. It is using [[SettingBasedMystery|设定系推理]] to extend the本格 pleasure into a world where monsters, magic props, and animal transformation are real.

In the source’s frame, new本格 and setting-based mystery are ways to renew artificial puzzle pleasure without apologizing for artificiality. The point is not that every premise resembles real policing; the point is that the clues and rules let the answer snap into place.

Key Claims

• 本格推理 prioritizes solvable mechanism: who, how, alibi, clue, false theory, and final reconstruction.
• Social explanation can exist, but it is not the main evaluative standard for this source’s folk-tale mysteries.
• Highly artificial settings can still be fair if their rules are introduced before the solution depends on them.
• The pleasure overlaps with [[PuzzleSnackMystery|推理薯片]], but can involve more elaborate rule-world construction.
• Setting-based mystery shows that fair-play deduction does not require ordinary realism; it requires rule consistency.

Connections

• [[SettingBasedMystery|设定系推理]] - source’s specific extension of本格 into invented rule-worlds.
• [[AoyagiAito|青柳碧人]] and [[MukashiMukashiAruTokoroNiShitaiGaArimashita|《很久很久以前，在某个地方有一具尸体》]] - source example.
• [[IssunBoshi|一寸法师]] and [[SaruKaniGassen|猿蟹合战]] - folk-tale cases.
• [[PuzzleSnackMystery|推理薯片]], [[ClosedCircleMystery|暴风雪山庄]], and Observation Before Inference - adjacent mystery concepts.
• Historical Detective Reasoning and [[DailyLifeMystery|日常推理]] - neighboring modes that use inference for different payoffs.