After her parents divorced, Shima Sumitomo lived with her mother. She felt uncomfortable living with her stepfather and she was unable to hang out with people at her high school. Shima Sumitomo decides to move to Hokkaido where her father lives. At her new high school in Hokkaido, she meets classmate Gen Tatebayashi and Wao Sakurai. They are the two most popular boys at her school. A principle of her school is that “Gen and Wao are for everyone.” If anyone breaks the rule, that person will be ostracized. Even so, Shima Sumitomo gets closer to Gen and Wao.

Aoi Nishimori’s parents moved to another city for work, but Aoi didn’t want to transfer to a new high school. She stays behind and lives in an apartment by herself. Shusei Kugayama moves in next to Aoi’s apartment. Shusei is a very popular student at their high school. Due to a mistake, Aoi makes the sprinkler go off in his room. Until Shusei’s room is fixed, he stays with Aoi.

The Harimaya Bridge is a drama about an American man who must travel to rural Japan to claim some important items belonging to his late son, from whom he was estranged. While there, he learns several secrets his son left behind.