But...the different is Sasaki confessed to Miyano when he's in third year and Miyano is in second year
Meanwhile, Kagiura already confessed to Hirano when he's only in first year
Sasaki had to wait about half a year(around 6 months) to receive the offical answer from Miyano
In the OVA, Hirano said something like they're only in a balance relationship, that was when after the festival which means Kagiura had been waiting for MORE THAN A YEAR and Hirano still HADN'T accept Kagiura feelings. And in the chapter 46.6, both Kagiura and Hirano didn't seem like they were dating, just remind that in the chapter Kagiura IS IN THIRD YEAR AND HIRANO IS IN MOTHER******* COLLEGE. Also, according to Miyano in chapter 46, he told Sasaki to wait a little bit longer so that he could go to the same college as Sasaki. I'm guessing the "a little bit longer" was around 2-3 months. Around the same time, chapter 46.6 happened and you know what I mean
I swear a snail is even faster than Hirano realizes his feelings for Kagiura