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In a peaceful-looking school where students live ordinary daily lives, there exists a student who seems completely unimportant at first glance.
Always sleepy. Always silent. Always avoiding attention.
That is Akiyama Haru-a student known for his lazy attitude and lifeless expression.
But behind his quiet school life lies a past no one knows.
Long ago, Haru was part of a hidden world of strength and conflict, where he was feared under a different name-"Sloth." The youngest leader of a silent order-like group, known for his overwhelming talent and calm brutality.
However, everything changed after a certain promise he made to his parents.
A promise to leave that world behind...
and live a normal, peaceful school life.
Since then, Haru disappeared from the underground world and became nothing more than an ordinary student-sleeping through classes, avoiding attention, and acting like he has no ambition at all.
But peace doesn't last forever.
When an incident during a school taekwondo class unexpectedly reveals his hidden skills, rumors begin to spread once again. People start questioning his identity, and the name "Sloth" slowly returns from the past he tried to bury.
Now caught between the life he promised to live and the world he once ruled, Haru must face what he tried so hard to forget.
Alongside his loyal friend Nakamura Kaito, and the energetic troublemaker Hoshino Akari, Haru's peaceful school life begins to crumble.
Because sometimes, the quietest promise hides the loudest past.