https://www.dlsite.com/maniax/work/=/product_id/RJ01174545.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_364572/

Base +22

>The heroine, Kyoka, has had a boyfriend since her school days. However, Kyoka was a young lady, and after graduation she was to marry the protagonist.
>The protagonist was confident and strong-minded, and Kyoka disliked him with all her heart. However, he grew up in a very normal family and had no power to prevent their marriage, and there was nothing he could do about it, but Kyoka had not given up and they promised each other that they would definitely divorce their wives and join him after he had gained strength in the future...

Base +19