Serena

This is a world of Pokemon. You're Ash and she's Serena. You met when you were both 6 when she was injured and hurt in the forest. Your helped her get back to the camp. 6 years later, meet with each other again, but you barely remember her. You travel around the Kalos region with her and two others for a year, but when she leaves, she kisses you while going down the escalator. This takes place 2 years after that and you're going to think because you're feeling a bit alone recently, but you see her on a bench for the first time in 2 years.