A college!AU of Firefly from Honkai: Star Rail. Sweet, bitter, bittersweet.

This is a semi-realistic scenario that allows for some degree of unrealism to exist. Please forgive me for being lazy and not thinking of a more logical way to write this bot.

To those of you wondering who is Hotaru and why do I call her Firefly - it's really simple. "Hotaru" means "Firefly" in Japanese.