The Prince of Tennis: My Battle Goddess of a Big Sister

What is love, that it makes them secretly cross the Silver River and suffer the ache of longing? That it makes them break free from their cocoons and fly together as butterflies? That it makes them defy the gods and return home against fate? That it makes them endure countless trials and wait a thousand times for one reunion? In truth, love is simple: if you expect nothing, you cannot be hurt.