GaCen no Kanojo

A high school student in Japan takes a part-time job at an arcade, where he is largely overlooked by others and nicknamed "NPC" for his tendency to fade into the background. This changes when Yaegashi Nanora, a striking and energetic girl, enters the arcade and asks for his help mastering its most challenging games. She soon proposes they start dating, leading to a summer filled with arcade activities and growing romantic feelings.