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The Chilling Japanese Tradition to Beat the Summer Heat: "Kaidan"

In many Western cultures, ghosts and horror are strongly associated with autumn, specifically Halloween. In Japan, however, horror is the ultimate symbol of summer. Even now, in late August, we love to share spine-chilling ghost stories known as Kaidan on humid, muggy nights.

But why tell scary stories in the summer? The answer lies in a uniquely Japanese life hack: we try to physically cool ourselves down by experiencing the chills of fear.

Japanese horror (often called J-Horror) is quite different from Hollywood slasher films with jump scares and chainsaw-wielding monsters. Instead, it focuses on psychological dread—the unsettling feeling of the unknown creeping into our daily lives and the deep darkness of the human mind.

This traces back to the traditional "Onryo" (Vengeful Spirits) found in classic Kaidan. The most famous example is Oiwa from the legendary ghost story, Yotsuya Kaidan. Betrayed and poisoned by her husband, Oiwa does not return as a zombie to physically attack him. Instead, she haunts his mind, appearing in his hallucinations and the quiet moments of his daily life, slowly driving him to madness. This style of "psychological torment rather than physical violence" is the very foundation of Japanese horror.

I personally love reading psychological horror novels, especially the masterpieces by Yusuke Kishi. The way he depicts a familiar, everyday world slowly warping into something terrifying—such as in his epic From the New World (Shinsekai Yori)—perfectly captures the true essence of Japanese Kaidan passed down since the era of Oiwa. It doesn't rely on sudden shocks, but rather a slow, creeping unease that stays with you long after the story ends.

As the lingering summer heat continues, why not try watching a classic Japanese horror movie or reading a translated Kaidan with a cold drink in hand? You might find that you don't even need to turn down the air conditioner to feel a sudden, freezing chill down your spine.