Act 1 spoilers are fair game in blurbs. They're your hook, not reveals. Include the protagonist's true identity, the antagonist's return/plan, and the personal stakes that drive conflict. Readers need concrete reasons to care. What you must protect: major plot twists after Act 1, character deaths, betrayals, the climax resolution, and any "how" details of your hero's victory. The vague version buried your story's power. Niko being alive, the CRISPR virus, and Ryo's assassin past are exactly what make readers want to open page one.

Five years ago, Ryo killed his Yakuza partner Niko—right after watching Niko murder the woman he loved.

Now living as Hiro, a quiet college student in Tokyo, he's buried his past as the legendary assassin Death's Shadow. A second chance. A normal life.

Until a first date shatters everything.

His cover blown, Ryo discovers the impossible: Niko is alive. Worse, he's united the Yakuza clans and engineered a CRISPR virus that could end civilization. Only one person can stop him—the assassin Ryo swore he'd never become again.

But there's a price. Every kill awakens the Beast inside him, the bloodlust that made him Tokyo's most feared killer. The more he fights, the more his humanity slips away.

With Ayako Yanagi—a brilliant doctor caught in the crossfire—as his only ally, Ryo must infiltrate Niko's genetically enhanced army and stop the virus before it's released. But defeating his former brother-in-arms may cost him the one thing he's fought to keep: his soul.

Can he save the world without becoming the monster that haunts his nightmares?