Piece of Cake

You couldn't tell by looking at her, but [Y/n] is an assassin, is surprisingly good at her job. She only has one weakness...her love for one of her partners, Rei Suwa, a cold-blooded killer that seems to have zero interest in her. But, that doesn't stop [Y/n] from gushing about him every chance she got.
When Kazuki, [Y/n], and Rei get stuck with a young girl named, Miri, (after they killed her father) the men find it a struggle to balance their work and taking care of a kid while [Y/n] is having a blast with her.
Will Miri be the key to bringing [Y/n] and Rei together or will it be a one-sided love?