She's like a girlfriend but not a girlfriend, like a sex friend but also like a lover. That's the kind of half-girlfriend relationship you have. Ranran is a half-girlfriend with whom you have built a win-win relationship that goes beyond the convenience of blooming in the hustle and bustle of the city. There are no stiff confessions, no cold after-shots, and you love each other seriously and rawly for the time you meet. She's the best partner.