Kirara: Its nothing. I just went to the barber for a bit (tidying up the hair part)
*Background: Camel shaped chocolate*
Yamaguchi: You look exactly like a flat chested girl
Kirara: .....
Yamaguchi: Moreover, why did you pierce your ears?
Kirara: Is it weird?
Yamaguchi: It's not but actually that looks pretty good on you.
Kirara: Then isnt it fine
*Yamaguchi's mom at the corner: Eh? He looks just like a girlfriend*
Kirara: There really isn't a reason.
*Flash back starts on the last panel at the very bottom, speech bubble said: 'Ah, this, its so cute <3'* Where in the next page it is shown that it's said by Kirara's mother.
It wasn't mention, it was only introduced as a new student starting second semester. The only thing we know is his name and he is short (Kirara said it)
Well, I'm guessing that its another competitor who will be going after Kirara, then Ken realizes his own feeling and everything plays out as all the typical BL we read lmao
If you are referring to the reason why Ken pushed Kirara out, it's probably cuz of Kirara asking Ken if he likes him, which makes Ken realizing it and getting all conscious about it. Hence pushing Kirara out of the house cuz he wanted some 'space and time' to think about it, but that's just my guess. The manga only showed Kirara asking Ken the question and Ken's reaction (there are no speech bubbles along with his reactions), then proceed to the push out of the house scene.
Long story short
>Ken pinned down Kirara
>Flashback to young Kirara being super oblivious and got saved by Ken before getting abducted or something
>Kirara asks if Ken likes him
>Ken brushed him off cuz there no way he likes a guy
>Heartbroken Kirara seen by the aniki and he brushed it off as nothing happened
>Didn't talk after the incident and summer vacation started
>Kirara went to dubai and came back in 1 panel
>Gave souvenirs to Yamaguchi and Kirara became even more effeminate than before, called a pettanko by Yamaguchi and almost mistaken as a girlfriend by the mom (Yamaguchi's)
>Yamaguchi asked why the piercing though, flashback to Kirara's mom picking up a piercing but doesn't want her ears pierced cuz according to some myth you get bad luck for piercing your ears. Kirara hears it and be like, then lemme pierce my ears cuz he want to change (his luck)
>Introduction of a new transfer student where Kirara calls him short at the back and ends with how Kirara was like his luck cant get any worse anyway