I noticed that the one on this site are just the separate cuts and not the full CG set with all the text. Figured some of you Japanese readers might enjoy it.

The peace of the Republic of Ravina was suddenly broken by Maqrikious and his 100,000 soldiers.
In this desperate situation, Maqrikious proposed a deal to Rya, the hero knight of the country, that he would not take lives of the people if Rya becomes his.
From that night, Rya's humiliating ceremony of feminization began. The wish of Maqrikious is to make Rya a woman forcibly and enjoy the hero's humiliation as his bride. As Rya's body was modified further and further, his mind was also changing...
milda7 presents a sensual world of forced feminization in 80 page manga with 150 cuts.

https://www.dlsite.com/ecchi-eng/work/=/product_id/RE109501.html