Oaite wa Ippan no Kata desu

A very popular idol asks him to be… her rental boyfriend. Kaito, a high school student with no money but a strong sense of justice, receives a request from the popular idol Nao to be her “rental boyfriend.” At first, Kaito refuses, but the high sum and the need to avoid harassment lead him to accept. However, it’s a trap set by Nao, who wants to stop being an idol by creating a fake boyfriend. To fulfill her wish, Kaito tries his hardest as her fake boyfriend. Nao is also trying to stop being an idol… (Source: Kadokawa, translated)