I Went Undercover and Became the Boss

Because of one moment's poor judgment, Tianhai Junya also embarked on a road of despair from which there was no turning back. He killed his teacher with his own hands, an act of ingratitude. He drove Dazai Osamu away to secure his position as boss, proving himself narrow-minded and unable to tolerate others. To consolidate his rule, he committed countless crimes, piling up a mountain of blood debts... Everyone cowered at his feet in fear. He was the shadow covering the world, a devil whose very name inspired terror. After being summoned by the Holy Grail, Chaldea's Master learns what happened in this world and is left baffled. "How have I never heard of someone this powerful before?" The Heroic Spirits he summons are strange too. They are: Boss Dazai from another world Mori Ogai, who died young in this world Mori Ogai from a parallel world who escaped disaster Nakahara Chuuya from a parallel world But why do the Heroic Spirits start fighting each other as soon as they've learned what's going on? Why are both Mori Ogais getting beaten up so badly? Reading notes: 1. This is an IF route for My Cover as a Spy Is to Become the Port Mafia Boss. 2. Walk the path of Boss Dazai, and leave Boss Dazai nowhere to go! Theme: Pray for the light, and live toward death