Ubawareta Osananajimi -Suki Datta Osananajimi wa Hoka no Otoko no Konyakusha | 奪われた幼馴染み ～好きだった幼馴染みは他の男の婚約者～

As the protagonist loses his job and returns to his hometown, there is something that has been bothering him. It was the presence of his childhood friend, Himemari Shirara in his hometown. She has been a good friend of mine since I was little, but when I was about to move to Tokyo, I ended up having sex with her on a whim. However, due to embarrassment and the fear that something might change, I tended to avoid Himemari and soon after i moved to the city we drifted apart. How should I treat her when I see her? When he returned to his hometown, he encountered Himemari and she treated him in the same manner as before. He was relieved to find that she treated him the same way as before and his unconsciously suppressed feelings for her began to well up.

However, it was only a short time later that he happened to see her having sex with a local man and he was shocked to learn that she was engaged to him. He is shocked to find out that she is engaged. He tries to keep hid feelings for Himemari to himself, but a sudden turn of events leads him to have sex with her again for the first time in years. He has mixed feelings about the change in Himemari, but can't help remembering the past. Later, Himemari's fiancé makes him a proposal that he had not expected at all. He asked him to play with her in front of him. Yoshinori was surprised by her fiancée's unexpected sexuality and by Himemari's agreement, but he accepted the proposal because he was still in love with her.

Then in front of her fiancé, Yoshinori embraces his childhood friend, Himemari, who now belongs to someone else and even shows him how he raped her. How long can such a relationship last?