Koibito Aika to Moto Kare -Futatabi Ano Otoko ni Dakare Kairaku ni Iki Kuruu Ai Suru Kanojo | 恋人・亜依香と元カレ ～再びあの男に抱かれ快楽にイキ狂う愛する彼女

The main character 'Akito Akishima' has a girlfriend named 'Shiroyama Aika'. While working at the same company, Akito had feelings for Aiika, but gave up on her because she already had a boyfriend. But when Akito hears a rumor that she broke up with her boyfriend, he desperately attacks her. And she gave me the OK to go out with her. Later, Akito changes jobs and moves to another company, but he and Aika are content with their life together on their days off. He was looking at proposing to her eventually and living a married life.

One day, there is a major personnel change at Aika's company and she finds out that her ex-boyfriend, "Mitaka Yuma", has returned and is working with her. Still, the relationship between Aika and the man was in the past and she didn't care. However, he accidentally sees them walking together in the city. But when he asks her about it, she says it's nothing, that they were just working together and Akito believes her.

After that, we didn't see each other for a while due to his busy work schedule and even when we did see each other occasionally, we began to feel a little distant from each other. What was going on between Aika and her ex-boyfriend while he couldn't see her ...? The incident changes the relationship between Aika and her "lover" and "ex-boyfriend".