As the girls of 1a and 1b have a crush on Izuku they all got together and thought to ignore him so that he can finally see that they loved him from the very start and only 3 didn't like the fact that the idea would work and they said no and walked away from them and later on during the week 3 of the girls told Izuku about it and they have earned their spot as his lover and became fiancés as they went straight from being Bf and Gf to being Engaged.