Sae is advised by Ms. Kujo, an exam tutor, to let Ruri, her daughter's rival, Miku to stay with them. Surprisingly, Miku's believed-deceased dad is actually Sae's husband, Hideyo! Miku conceals her true identity, sparking intrigue within the household, especially towards Sae's husband Hideyo, who is oblivious to the potential family disruption.
