Hibiki Shimada, a normal 17-year-old high-school student, still does not know how to fall in love—although surrounded by love "experts"—until one day she realizes she's fallen in love with her hot and nice 26-year-old teacher, Itō. She then takes a path to make her teacher understand how she feels for him.

Female students, including Hikari Tomonaga, from a high school cheerdance club follow strict instructions from their teacher Kaoruko Saotome. They compete at the USA Cheerdance Championship.

High school student Naotatsu travels to live at his uncle's house. In the pouring rain, he is picked up at the nearest station by a strange adult woman named Sakaki who guides him to an unexpected share house where a life together begins.

Story takes place 2 years after "Chihayafuru Part 2" and Chihaya is now a high school senior.