Shishio Academy isn't your typical elite school; it's a "jungle" where every student's worth is dictated by game results.

As an undefeated veteran of underworld games, Guren’s true power is forced out when the school's "darkness" targets those close to him.

A central pillar of the plot is Guren’s protective, albeit sometimes strained, relationship with Karen, who serves as both his motivation and his greatest vulnerability.

In of Jishou F-Rank no Oniisama , the stakes at Shishio Academy reach a boiling point as Guren Saijou continues his strategic climb from the bottom. This chapter, originally serialized in Monthly Comic Alive , follows Guren as he balances his desire for a "normal" school life with the necessity of protecting his sister, Karen , using the ruthless skills he honed in the underworld. The Core Conflict: Brain Battles & Underworld Legends

The story seamlessly mixes ecchi comedy with serious psychological drama and school-life "power fantasy" elements. Where to Follow the Series