The protagonist, who works for a publishing company, is a very ordinary man who leads a life where nothing goes well.
One day, he receives a prescription for a "likability supplement" at a clinic he found on the Internet. After taking it, he begins to see a number above humans’ heads that represents how many people have a favorable impression of the person.
While his colleagues have double-digit numbers and a talented guy has over 500, he is shocked to see that his likability is only 4.
Then, he takes a training to increase his likability at the clinic, and his life starts to change…