"Supernatural natural phenomenon"

The expression “supernatural natural phenomenon” is Tatsuji Chibiki’s attempt to describe the calamities surrounding Yomiyama North Middle School Third-Year Class 3 without reducing them to a revenge story. Its apparent contradiction is deliberate: the phenomenon is supernatural in its effects, yet natural in the sense that it unfolds without intention, moral judgment, or a conscious agent. That distinction changes how the class must respond. The danger cannot be defeated by appeasing an angry spirit; it can only be managed through a fallible strategy whose rules resemble practical measures taken against weather or other uncontrollable forces.

Definition and Rejection of the Curse

Chibiki explicitly rejects the idea that the calamities constitute a curse. The incident involving Misaki Yomiyama twenty-six years earlier may have initiated the chain of events, but the later deaths do not occur because an angry spirit is seeking revenge or because the hidden casualty deliberately wishes anyone harm. No person’s malice or desire to injure others stands behind the deaths. At most, observers may sense the malice of an invisible force, but Chibiki treats that impression as psychologically comparable to the hostility people attribute to any natural disaster.

The expression therefore separates origin from agency. A past death can be the starting point of the phenomenon without becoming a continuing will that directs it. The calamities are frightening precisely because they do not answer to human motives. There is no enemy to persuade, punish, or understand in ordinary ethical terms; there is only a process whose effects fall upon the class.

The Phenomenon and the Class Strategy

Chibiki describes the process as simply happening and calls it a natural phenomenon, while qualifying it as supernatural. The class’s countermeasure follows the same logic. When an extra person, or casualty, is hidden among the students, records and memories are altered so that contradictions appear normal and the casualty’s identity remains concealed. The resulting danger is not controlled by the casualty’s personal action. It is produced by the phenomenon’s operation, which distorts recognition itself and makes ordinary evidence unreliable.

The strategy known as the “Not There” Strategy is consequently an attempt to reduce exposure rather than a guaranteed cure. The selected person may be treated as absent at school, while interaction outside school can remain permissible; however, school activities outside the school building may still fall under the restriction. Because none of the guidelines is absolute, participants cannot determine with certainty which breach will cause the strategy to fail. The rules create a precarious practical discipline, not a system of supernatural law that can be applied with complete precision.

The Umbrella Analogy

Chibiki explains the strategy through rain. The most effective way to avoid getting wet is not to go outside; if going outside is unavoidable, an umbrella offers protection. Yet an umbrella cannot guarantee dryness. The angle at which it is held and the way a person walks can still leave that person soaked, even when the rain itself falls predictably. The analogy preserves both the usefulness and the limits of the class’s precautions: imperfect protection is still better than abandoning protection altogether.

Mei Misaki adds that the situation could also be compared with drought and rain dances. Her comparison shifts attention from mechanical prevention to ritualized human response. A rain dance may express the desire to influence conditions that remain beyond human control, just as the class’s rules give form to its fear of the calamities. Neither analogy proves that the measures work through a comprehensible causal mechanism. Together, however, they present the strategy as a rational response to uncertainty, one that remains meaningful even when its success cannot be guaranteed.

Recognition, Exclusion, and Consequences

The phenomenon’s effects extend beyond physical death into the social order of the class. Because memories and records are tampered with, students can accept impossible details as ordinary and fail to recognize the casualty. The class must therefore impose an artificial absence on one of its members. Chibiki explains that people with no direct link to Third-Year Class 3 are comparatively safe, which is why he can interact normally with Koichi Sakakibara and Mei and why Mei has been able to obtain information from him in the Secondary Library.

The same logic produces a severe contradiction in the class’s treatment of Mei and Koichi. After the attempt to increase the number of students treated as absent from one to two proved ineffective, there was no reason to continue ignoring both of them. Following Mr. Kubodera’s death, the class gradually began interacting with Mei again, without any formal announcement or collective decision. The shift shows that the phenomenon governs behavior indirectly: fear first produces rigid exclusion, then evidence of failure quietly dissolves the exclusion.

The rules also invade family life. Reiko Mikami and Koichi had to treat one another as separate people in different settings, with Koichi addressing her as Ms. Mikami at school and Reiko at home, while she maintained the same division. Most of the class, including Mr. Kubodera, knew the truth from the beginning. Even so, the class’s June tactic required them to behave as if both Mei and Koichi were absent, and Kubodera defended the decision by referring to Mikami’s difficult position. The expression thus names a force that turns ordinary relationships, memories, and forms of recognition into unstable territory.

Narrative Significance

“Supernatural natural phenomenon” gives the calamities their governing paradox. The story acknowledges supernatural impossibility while refusing the consolations of a personalized haunting. The phenomenon can alter memory, recruit social rules, and produce deaths, but it does not supply a villain whose intentions would make the disaster morally legible. This is why Chibiki’s explanation is both clarifying and disturbing: it replaces the simpler idea of a curse with a model closer to weather, while the weather in question can rewrite the human world.

The phrase also captures the status of knowledge in Third-Year Class 3. Students must act as though patterns exist, because ignoring the phenomenon is more dangerous than adopting precautions, yet they cannot convert those patterns into absolute laws. The class’s strategy is like an umbrella held in uncertain rain: concrete, communal, and indispensable, but always vulnerable to the angle of a step that no one knows how to measure. In that tension between practical response and irreducible mystery, the expression becomes one of the book’s clearest formulations of the calamities’ nature.