Honkai: Star Rail: No Path? My Sun-and-Moon Breathing Shatters the Star River!

After transmigrating into Honkai: Star Rail, Su Mu finds himself trapped in an apocalypse, facing the Antimatter Legion's encirclement. No System? No Path? So what? Memories of the Sun and Moon Breathing techniques from his previous life have awakened!

In this universe filled with Imaginary Energy, Breathing techniques undergo a world-shaking transformation!

Inhale, and plunder Imaginary Energy from within; exhale, and unleash sword pressure capable of destroying stars.

Sun Breathing, fused with Destruction and the Hunt: a flash of blazing red steel burns away mara, reducing even Stellarons to ash!

Moon Breathing, interwoven with Nihility and Remembrance: countless blades shaped like full moons tear through space, their trajectories beyond even an Emanator's ability to follow!

Kafka: "His heartbeat knows no fear. His sword... can cut through fate."

Firefly: "Su Mu's blade is so warm, it can even suppress my entropy loss syndrome."

As the Lord Ravager descends and the universe trembles, Su Mu closes his eyes and activates [Transparent World] and [Demon Slayer Mark], drawing the ordinary iron sword at his waist.

"Flame Breathing: Thirteenth Form, "

That day, the entire universe beheld a blazing sun that cleaved the galaxy in two!

Things to avoid: Never have the protagonist fall under Kafka's control through her Spirit Whisper. His [Selfless State] makes him immune from the start, establishing them as equals. Don't let his combat power grow too quickly. His growth comes from his body becoming able to contain more Imaginary Energy.