High school student Yuta Asamura begins living with his stepsister Saki Ayase and her mother due to his father's remarriage. Both Yuta and Saki, who hold cautious values regarding relationships between men and women, agree to live with an appropriate sense of distance between them.

Yuta and Saki take turns making missteps in their new, still somewhat awkward home life together. As they reflect on these mistakes and figure out how to move forward, Saki realizes she's less and less sure how to feel about Yuta.

Saki asks her classmate Narasaka Maaya to come over after school and help her study. Yuta decides to make dinner for a change so Saki can keep studying. Maaya helps Yuta with the recipe and then starts interrogating him about his relationship with Saki.

Yuta and Saki accept Maaya's invitation to go to the pool with a group of friends. Saki enjoys the time at one of her favorite places and is finally able to let loose a little. Then, on the way home, Saki blurts something out that leaves Yuta speechless. (Subs Flix_)

Saki spends time with Maaya and friends while Yuta gets to know Fujinami. In their own separate ways, Saki and Yuta start to understand the feelings connecting them... in this story of a relationship that may one day become love.