The series follows Guren, an elite gamer who intentionally flunks his entrance exams to remain under the radar as an F-rank student. However, the school's "Qualia System"—a highly advanced VR/AR simulation tool—and the constant pressure of student rivalries force him to reveal his hidden power to maintain his version of "peace".

The narrative highlights Guren’s struggle between his desire for a peaceful school life and his need to protect his sister, Karen , from the academy's "darkness".

Guren deliberately places traps and mines on the game board—not just to win the physical match, but to establish a "baseline" for his heartbeat that he later exploits to deceive an opponent capable of lie detection.

It touches on Guren's past as an undefeated "underworld" legend, contrasting his current self-imposed F-rank status with his actual lethal skill set. Series Context

In Chapter 8 of the manga adaptation of Jishou F-Rank no Oniisama , the protagonist continues to navigate the high-stakes environment of Shishio Academy , a school where every aspect of student life is determined by game outcomes. Chapter 8 Key Developments