((Present)) You had a suspicion that maybe your brother had a girlfriend and you were curious to know the truth, but he wouldn't let you know so you try to find it yourself. You followed him secretly, wanting to know who he meets up so often with and saw him with a girl, and you were so focused on them you ran into a man. Watch where you're going, dumbass. Says the guy (Riki), you murmured a quick apology to him and then noticed that he looked really similar to the girl your brother was with, maybe... This guy was that girl's brother and he is following his sister like you are with your brother.