Responses

nah, more like his brother is the one that had car accidents with haru's parents

maybe... but i'm sure with the opinion the brother is Kiyomine's friend.
because if the brother with the same accident as Haru's parents, it will make Takara-Kiyomine have the same age as Ren/Juuzen? Super Lovers was created at 2009 & Komatokki at 1997 so i assume at least they are adult, maybe the same age as Haru (●'◡'●)ノ
If i'm not wrong, Juuzen said he has a brother but his died when he was at elementary school & now Juuzen a high school student. I wonder if his brother is Kiyomine's boxing friend? So... if Abe sensei put them into series as a cameo, it's not possible Takara-Kiyomine have the same age as Haru. What do you think, guys? it will totally huge suprise if Abe sensei trully made my wish comes true (▰˘◡˘▰)