A sexy spy and an elite assassin enter into the world's sweetest, deadliest marriage of convenience! Himuro, Neneko's devious handler, has succeeded in turning the innocent girl into Omi's most glaring weakness. Moving on to the next phase of his plan, Himuro dispatches another agent to ingratiate himself with Neneko at her cover job and wait for a chance to strike. Soon enough, Neneko takes Omi with her on a company retreat for what is supposed to be a relaxing time in a hot spring town...