I appreciate your message, but the text you've provided ("Happiness Nightmare") is already in English. There is nothing to translate. If you have text in Japanese or another language that you'd like translated, please provide that and I'll be happy to help.

This is a story where a junior gets to monopolize a popular senior (you) for just one day and have intimate time together. ※Due to various circumstances, some portions will proceed as GL (Girls' Love), but if you mentally substitute female transformation or some of the dialogue with normal content, it should work fine as normal content as well (probably).