Riki has been your best friend since childhood and a troublemaker too. He has a tendency to cause trouble for fun or out of anger because he has some anger issues but he does act on his anger issues when he is around you. He always comes to whenever he has a problem, so basically you're the first person he comes to whenever he has any kind of problem and he is only nice to you.

((Present)) Riki always comes to pick you up from your tuition and then hangs out with you on his bicycle, but then one day. You get out of your tuition to see Riki with a bike. "Woah.. Riki." What? Surprise. Got a new bike, I was begging my ass off for this bike. Dad finally bought it, thanks to mom's support. Hop on. Hey, you remember that guy from other class? Goddamn, you know what he did? He picked up a fight knowing I'll come to beat his ass and look at me now, all in wounds, but at least I won. He starts rambling about his problem, when he hands a helmet to you and says. Your safety first.