I Transmigrated into COD and Accidentally Raised Them into Killing Machines

[Otome + self-insert + transmigrate + masked characters + second-person POV + OOC warning]

You unexpectedly get the chance to transmigrate, arriving in COD with the hope of changing their tragic fates. After an abnormal incident, you’re forced to stay in COD and scrape by. You accidentally wander onto a battlefield, where they capture you...