It Seems Like I Got Transmigrated Into An Eroge

I have a brother who's a bonafide Otaku. One time, he introduced me to this game called 'Spirit Infinite'. An Eroge bishoujo game is particularly popular among young lads. Its popularity stems from 15 beautiful heroines. The game's story revolves around the protagonist named Shin Morino, an idealist of justice and peace. On top of that, a cheat protagonist whose main goal is to stop the world's destruction, but while at it, conquer girls along the way. Then I, Fukushima Aki, a young adult who died at the age of 19 from a terminal illness. Living in the hospital, nearly my entire teenage life, shackled unto my bed, but that all changed when I died. I was granted a second chance to live a new life. However, that second chance was to live in the world of Spirit Infinite, the same game that my brother introduced to me. What's more, I'm not even the protagonist but a nobody... With a handsome face? Who am I? Nonetheless, with this second chance, I will live my life to the fullest!