Transmigrated as the Terminally ill Cannon Fodder Prince [BL]

I was an average otaku guy. I spent my days reading manga and playing otome games. I was happy, that is, until one day when I was walking home from school, I was hit by Truck-kun! When I died, I met a goddess who told me that I died by accident and thus she will transmigrate me in a fantasy world as the hero where I will have my own harem of 300 women! But this is not what I expected! Where was my harem of 300 women? And most importantly, why did I get transmigrated in the otome game that I hated the most, "Love in the Midst of Chaos: Lunar Crest Academy" as Kalin, the cannon fodder terminally ill prince who was destined to die at the young age of 14!?!