A maid suddenly appears at the house of high school student Hitoyoshi Yokoya, asking to be hired. However, her background as a former assassin makes Hitoyoshi think twice. From this fateful encounter, their lives together will forever be changed.

Consulting Naka, Yuki decides to select a birthday gift for Hitoyoshi. Meanwhile, Riko manages to wake up Hitoyoshi. Filled with fear and anxiety, he worries about what his dad would think of the real Yuki as he's about to face his biggest challenge.