Mei returns home one evening to find Nagisa-san giving a cooking lesson to Misato, Mei's mother. Misato explains that she wants to surprise Mei's father on his sixtieth birthday with a home-cooked meal. Later, Mei consults Nagisa-san about how to use the occasion to reconcile her mother and her younger sister, Yui, who ran away from home three years ago. Meanwhile, Mei notices that Yuta is hiding something from her, even as he seems to be increasingly attracted to her…

Mei becomes curious about Nagisa-san's past. But her housekeeper remains tightlipped about anything to do with his private life, which remains shrouded in mystery. After all other means fail, Mei decides to follow him after he leaves her house to see where he goes, and she discovers a side of Nagisa-san couldn't have imagined. Meanwhile, Yuta begins to have nagging doubts about whether Nagisa-san is really Mei's father…

Nagisa-san becomes visibly troubled after seeing a woman at Mei's workplace and starts having accidents in the kitchen and other mishaps. Concerned that something is bothering him, Mei finally gets Nagisa-san to open up about his secret past. Meanwhile, Mei and Yuta, aware of their strong feelings for each another, have a series of awkward encounters. Then, frustrated at not being able to take their relationship to the next level, Yuta does something drastic and unexpected…