i'm really glad you liked it!
oh, you need to get at least 3 romance points to reach the romance ending, the easiest way to do this is to pick at least one good answer and then pick the "NO NO MAYBE NOT" (paraphrased) option for the valentine's day choice.
since, well, MC is a tsundere, so you need to pick the tsundere options to date the guys. you'll know you've got enough if MC either calls him cute (Carol) or calls his smile blinding (Noct)
if this is like a problem, i'll make a walkthrough on the romance options available.
thank you for your comment, and i'm glad you liked the game!