"Koinaka" is a Japanese term that translates to "lovers" or "in a relationship." It is also the title of a Japanese television drama series that aired in 2015. The story revolves around Aoi Miura, a young man who reunites with his first love, Akari Serizawa, after several years apart. Their rekindled relationship faces various challenges as they navigate their feelings and the complexities of adulthood. The series is known for its heartfelt storytelling and exploration of themes such as love, friendship, and personal growth.