My Younger Sister's Suitors Like Me

When I opened my eyes, I had become a supporter in a nurturing simulation game. The protagonist is none other than my younger sister, Rose, whom my parents brought home. After raising her with the utmost care, meticulously managing every single stat on her status window, I finally held my sister's hand and entered the Academia. However, the candidates for my sister's future husband that I meet here... Every single one of them is insane. One of them is supposedly an ancient evil dragon in disguise. Another is an arrogant prince with nothing but overflowing wealth. And that one? What, a split personality? Unable to just stand by and watch, I rolled up my sleeves and began their charact...