Maybe it was mutually decided? I feel like I need to reread to check if there's a missing chapter too lol But yeah, I'll just think they started dating after the kiss. Just waiting for the magic word to come out in their mouths. That way we'll be enlightened.
they had finally labeled their relationship as boyfriends (i forgot which chapter it was lol it was before the birthday tho) it's not really ur typical confession but still, that alone was enough for both of them to acknowledge each other's mutual feelings. so yes, they are dating!! ლ(´ڡ`ლ)
DID THEY START DATING WHEN THEY KISSED??????? WHAT, I DID NOT GET A MEMO WTH. HAHAHAHA ADORABLE STORY THOUGH, A BIT CONFUSING BUT VERY CUTE