Who Is the Sender?

Kobato decides to become an honest, humble citizen after enduring a bitter experience known as “wisdom work.” He forms a pact with Osanai, his classmate with the same goal, and they plan to enter high school leading quiet lives. But for some reason, inexplicable events and disasters keep happening around them. Will Kobato and Osanai ever manage to live ordinary, peaceful lives?

Masataka works as a freelance writer. He has been married to Yukie for the past 7 years. Yukie works as a school teacher. Masataka and Yuki are not in love with each other. They just haven't gotten divorced. Meanwhile, Masataka is having an affair with a young woman who delivers newspapers. This leads to a shocking situation.

Natsuha Mai is a 17-year-old high school student. She begins to work part-time, during her summer vacation, at her uncle's batting cage center. There, she meets a mysterious man named Ito Tomohiro. He is a former professional baseball player and he claims that he can discern a person's worries by looking at their batting swing. Ito Tomohiro comes to the batting center every night that Natsuha Mai works and watches female customers take batting practice. He tries to solve their worries by using baseball theory.

Yōsuke works as a copywriter for an advertising agency. His wife, Aiko, informs him that she is pregnant. Due to a case, Yōsuke asks for an unusually long six-month paternity leave. Nobody at his workplace has taken a six-month paternity leave before. A few months later, Yōsuke's daughter is born.

Tin Jat-hung, a single guy, has been unsuccessful in getting a girlfriend. One day, he discovers that his boss, KK, secretly collects photos of him, and he soon learns that KK is in love with him. Unsettled by KK's bold confession and romantic pursuits, Tin Jat-hung seeks advice from his friends and discovers that his male coworker, Siu-muk, is also in love with him. Caught in a love triangle, Jat-hung navigates through his feelings for his two love interests.