After resolving their differences, Saito and Akane begin to enjoy spending time together and all seems to be smooth sailing. Until one day, when Akane works herself too hard and gets sick, leaving Saito to take care of her.

With Shise's discovery of their secret, Saito and Akane scramble to keep others from finding out. Meanwhile, Akane encounters haunting events at home.

Himari reveals to Akane that she has a crush on Saito. While Akane agrees to help her get closer to Saito, she can't shake a nagging feeling.

A mysterious girl suddenly appears before Saito and he soon finds out that she's Akane's little sister.