The series follows Mizuki Hayama, a girl suffering from a rare and extreme case of hyper-lactation, causing her breasts to constantly and painfully swell with enormous quantities of milk. Desperate for relief, she turns to her childhood friend, Shuuichi, begging him to drink directly from her overflowing tits. What begins as a desperate measure quickly evolves into a deeply pornographic exploration of their mutual lactation fetish. Each episode escalates the lewdness, showcasing incredibly explicit scenes of Shuuichi sucking, kneading, and motorboating her massive, milk-gushing breasts. Mizuki's arousal from the sensation of being milked leads to intense paizuri (tit-fucking) sessions, where she clamps her massive, slippery jugs around his cock, riding him until they both cum in a messy, milky explosion. Their encounters progress from simple milking to full-blown intercourse, always centered around her unstoppable milk production, covering them both in sticky, sweet breast milk as they fuck in various positions.