What is the Tunnel Effect? Shin's survival in Sakamoto Days chapter 216 explained

With the release of Sakamoto Days chapter 216, the manga finally revealed what happened after the previous chapter's cliffhanger ending. Just as Kei Uzuki slit Shin Asakura's neck, Atari rescued him using her remaining luck through a phenomenon called the Tunnel Effect, leaving readers wondering what it exactly is.

As explained by Atari in Sakamoto Days chapter 216, the Tunnel Effect is a phenomenon in which a particle can penetrate a barrier greater than its own energy. This rare phenomenon essentially saw Kei Uzuki's sword pass through Shin Asakura's neck, preventing him from being injured in the first place.

Disclaimer: This article contains spoilers from the Sakamoto Days manga.

Sakamoto Days chapter 216: What is the Tunnel Effect?

Shin Asakura as seen in Sakamoto Days chapter 216 (Image via Shueisha)

As seen in Sakamoto Days chapter 216, the manga opened from where the previous chapter ended. After Kei Uzuki was shown slicing Shin Asakura's neck, fans were left very worried about the series' deuteragonist.

However, through some miracle, Shin survived and later noticed Atari squeezing his left arm. As evident from the manga, she had come to rescue him at the eleventh hour by using the remainder of her luck.

Shin Asakura and Atari as seen in Sakamoto Days chapter 216 (Image via Shueisha)

Amidst this, while Shin was happy to realize that he was alive, he was also shocked because he was certain that Kei Uzuki had slashed his neck. That is when Atari explained to Shin that he was saved due to the Tunnel Effect.

According to Atari, the Tunnel Effect is a phenomenon in which a particle can penetrate a barrier greater than its own energy, even though the odds of it happening are extremely small. In other words, the particles in Shin's body and the particles of Kei Uzuki's sword miraculously managed not to collide.

Atari as seen in Sakamoto Days chapter 216 (Image via Shueisha)

This term is widely used in physics, as it is described as a quantum mechanical phenomenon where a particle can penetrate through a potential energy barrier higher in energy than the particle’s own kinetic energy.

Meanwhile, in experimental psychology, the Tunnel Effect is described as a phenomenon where a single object moves beyond an occluding object and then reappears on the other side after a suitable amount of time.

Atari and Shin as seen in Sakamoto Days chapter 216 (Image via Shueisha)

As expected, Shin Asakura was bewildered by this development as he could not believe an object could pass through another, let alone Kei Uzuki's sword passing through his neck.

That is when Atari explained how her "luck" ability worked in this situation. No matter how minuscule the chance, as long as something was technically possible, it could be manifested through her "Good Luck" ability.

Shin Asakura, Atari, and the Order and X organization members (Image via Shueisha)

While this development saved Shin Asakura, Atari, having drained all her good luck, was then going to bring bad luck to the deuteragonist. On queue, members of the Order and X's organization arrived at the aquarium, threatening both Shin Asakura and Atari's lives with their attacks.

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About the author

Gokul has been an anime writer in Pop Culture division at Sportskeeda since 2022. His love for watching anime and his interest in the ever-growing anime industry inspire Gokul to produce insightful content about the genre on a daily basis. He holds a Master's degree in Communication & Journalism, and has worked for close to 3.5 years in the field.

Gokul likes to thoroughly research about the anime he is writing about and only credits a source after verifying its credibility. He loves the popular Shonen anime, Black Clover, for its memorable characters and their development throughout the story.

When not racking his brain behind his next anime story, Gokul likes to play video games, read manga, and play football.

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Edited by Gokul Chettiyar