Honki de Shitemo Ii desu ka?

Yukari was traumatized by her relationship from when she was in university and she has come to avoid romance ever since. When she heard that her ex will be attending their upcoming class reunion, she unintentionally promised to bring along her boyfriend despite not even having one. In her panic, she decided to "rent" a boyfriend, and the rental boyfriend who appeared on that day was a handsome and hard-to-grasp, younger guy...

(Source: Kodansha, translated)