He's Just an Ordinary Person

A hugely popular idol asks him to be... her rental boyfriend.

Kaito, a high school student with no money but a strong sense of justice, is asked by Nao, a hugely popular idol, to be her "rental boyfriend"!!
At first, Kaito refuses, but the large fee and the need to prevent stalking lead him to accept. However, this is a trap set by Nao, who wants to quit being an idol by creating a fake boyfriend!!!
To fulfill her wish, Kaito does his best as her fake boyfriend. Nao, too, does her best to act like his girlfriend, even in sexual matters, in order to quit being an idol, but gradually Nao finds herself attracted to Kaito...

Source: NicoNico Manga, Translated