Lethe was raised as an assassin, but in reality, she loves bringing joy to people! She worked at a restaurant and has a passion for cooking dishes that bring smiles to people's faces. However, the restaurant where she worked was actually a secret organization where customers could order from a "secret menu" to arrange assassinations. One day, the police grew suspicious of the operation and planned to raid the restaurant. Lethe's boss decided to shut down the shop to evade the police's scrutiny. 