Buddy Daddies

Miri Unasaka, a four-year-old girl, arrives in Tokyo on Christmas Eve in search of her father. She ends up at a large hotel, where she meets Kazuki Kurusu and Rei Suwa, two professional assassins living together. Kazuki and Rei were in the middle of a mission, but after things go awry, they're tasked with returning Miri to her mother. However, Miri's innocence and energy soon win them over, and they decide to raise her together, adopting the nickname "papa" for themselves.