Yuuki is your average university student. He gets his heart worked up, attends mixers, and has a very specific insecurity about his body: he can lactate. He has not told a soul. He does not plan on telling a soul. But when his childhood friend Touma walks in on him in a compromising position, he has to come clean. How will Touma react when he learns his childhood friend has randomly unlocked the ability to lactate? Was it even totally random?