Ep. 1: Los asesinos Kazuki y Rei cuidan a Miri tras un fallido ataque en Nochebuena que arruina su cobertura

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Two professional assassins, immature Kazuki and stoic Rei, assassinate a smuggler but are abruptly called away to care for their daughter Miri. Several months previously on Christmas Eve Kazuki and Rei share an apartment while operating as assassins with support from their handler Kyutaro. Kazuki is haunted by memories of abandoning his pregnant lover to protect her from his assassin career, but sends her money regularly. Their next target is a human trafficker hosting a party at a hotel. Kazuki infiltrates the party delivering a cake with Rei inside the food trolley. Meanwhile, a young girl named Miri arrives in the city alone, heads to the hotel and enters the elevator with them, ruining their plan. Miri reveals she is looking for her father, who she has never met, as her mother had told her he would definitely be at the hotel on Christmas Eve. Miri unknowingly blows their cover and she is taken hostage by the target. Kazuki frantically claims he is Miri's father, so Miri jumps into Kazuki's arms allowing Rei to shoot the target. Returning to their apartment with Miri they find photographs in her bag revealing the target they killed was Miri's biological father. (Source: Wikipedia)