Spoiler
Not sure but from season3 it seems like brown hair killed them...mc is an unreliable narrator
Holy shit the plotwist of the season.... Σ( ￣□￣||)
Spoiler....
It's still not clearly told if ml killed them on uke's request or he himself killed them. It will be revealed in upcoming ch of s3. And yeah they knew each other from childhood. Their childhood is actually the reason why seme says they are density. They actually indeed are destined. You will love s3.
well shit you got me excited
SO... basically they were brutally bullied one day brown haired dude lost his memory due to head trauma then blue haired dude k*lled the bullies ??!! And they knew each other when they were kids???!! HUH???!!??