Urgh, I hate this new character. She's such an aggregation of bad tropes.
Lilin's antics were cute enough, and seeing her and Osamu's relationship develop was nice, but if this is the way this manga is going to go, with """""hilarious""""" misunderstandings and gratuitous romcom (and of course both the childhood friend and alien girl had to be absolute bombshells who melt as soon as MC touches them), it might not be worth sticking around in my book.