Kurusu Kazuki e Suwa Rei são assassinos. Na noite de Natal, enquanto realizava uma importante missão, Kurusu se depara Miri, uma garotinha de 4 anos que está em busca de seu pai.

The assassins' life with their new charge is no walk in the park... especially when a new job comes up!

The guys decide it's time to say goodbye to Miri as they take her back to her mother... but there'll be one last time on the playground first.

Taking care of Miri is a full-time job, but the boys may have found their salvation: Daycare! But enrolling her won't be as easy as it looks...

Despite their (eventual) daycare triumph, Miri's presence is putting a crimp on the buddies' finances. Looks like it's time to take on a few jobs...

Kazuki is determined to be a more attentive parent to Miri. But investigating a fight she got into at daycare might put him on her black list!

A change in season dredges up bad memories for Kazuki, who's already feeling overworked and unappreciated at home.

A trip home for Rei leads to an uncomfortable ultimatum issued by his hitman father. Meanwhile, Kazuki and Miri are preparing a surprise...

When Miri's daycare holds a field day, each of the buddies work at encouraging her in their own way.

An unexpected encounter at the daycare leads Kazuki and Rei to seriously reconsider their guardianship of Miri.

While adjusting to life without Miri, Kazuki and Rei find themselves facing a new challenge...

Miri sings at the Christmas party, while Kazuki and Rei decide to settle matters with the organization.